fix: A21 phase 1 — 352 routes async sans await → threadpool (v7.8.0)

- Conversion `async def` → `def` de TOUTES les routes dont le corps ne contient
  ni `await`, ni `async with`, ni `async for`, ni `asyncio` (scan automatique
  corps par corps sur app/ : 352 converties, 0 dangereuses, vérifié
  `asyncio`/`run_coroutine`/`.result()` absents). FastAPI exécute ces handlers
  dans son threadpool → tout leur SQLite (`get_conn()` + `conn.execute`) quitte
  l'event loop, sans changer une ligne de logique.
- Répartition : api_v2 60, dashboard 40, collections 25, board 23,
  workspace 19, wiki 17, permissions 14, api 14, main.py 6, + 35 fichiers.
- Les 4 routers prioritaires de l'audit sont couverts par ce lot :
  api_v2 60 + dashboard 40 + collections 25 + board 23 = 148 conversions
  (le reste de leurs routes attend la phase 2 : elles ont de vrais `await`).
- Reste (phase 2) : les 311 routes avec de vrais `await` → enrouler les blocs
  DB dans `await anyio.to_thread.run_sync(...)` ; pas de wrapper partagé livré
  (rien ne l'appellerait — YAGNI jusqu'au premier usage).

suite **1037/1037** (233 s) · `ruff check app tests` OK · docs à jour

app/routers/board.py

@@ -66,7 +66,7 @@ def _ensure_block_ids(blocks) -> None:
 
 
 @router.get("/api/wiki/pages")
-async def wiki_page_search(request: Request, q: str = Query(default="")):
+def wiki_page_search(request: Request, q: str = Query(default="")):
     """v5.11.0: page picker for [[ wiki-links. Fuzzy-ish title search across
     every non-deleted page the current user can see (single source: pages)."""
     q = (q or "").strip().lower()
@@ -98,7 +98,7 @@ async def wiki_page_search(request: Request, q: str = Query(default="")):
 
 
 @router.get("/api/wiki/titles")
-async def wiki_titles(request: Request, ids: str = Query(default="")):
+def wiki_titles(request: Request, ids: str = Query(default="")):
     """v5.11.0: resolve page-id lists to current labels (rename propagation)."""
     parsed: list[int] = []
     for part in (ids or "").split(","):
@@ -179,7 +179,7 @@ async def set_page_options(request: Request, page_id: int):
 
 
 @router.get("/api/page-templates")
-async def list_page_templates_api(request: Request):
+def list_page_templates_api(request: Request):
     """v5.12.0: built-in + user global page templates for the picker."""
     user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
     uid = (user or {}).get("id")
@@ -899,7 +899,7 @@ def _apply_sorts(cards: list[dict], sorts: str) -> list[dict]:
 # ═══════════ Library page ═══════════
 
 @router.get("/library", response_class=HTMLResponse)
-async def library_page(request: Request, owner: str = Query(default=""), repo: str = Query(default="")):
+def library_page(request: Request, owner: str = Query(default=""), repo: str = Query(default="")):
     """Library page avec onglets Recents, Favorites, Shared, Private — scopé au workspace."""
     from app.templating import ENV
     env = ENV
@@ -943,7 +943,7 @@ async def library_page(request: Request, owner: str = Query(default=""), repo: s
 # ═══════════ Favorites API ═══════════
 
 @router.get("/api/favorites")
-async def list_favorites(request: Request):
+def list_favorites(request: Request):
     """List favorited page IDs for the current user."""
     user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
     uid = user["id"] if user and user.get("id") else 1
@@ -1033,7 +1033,7 @@ async def unpublish_page(request: Request, page_id: int):
 # ═══════════ Trash (must be before /{owner}/{repo} catch-all) ═══════════
 
 @router.get("/api/trash")
-async def list_trash(request: Request):
+def list_trash(request: Request):
     with get_conn() as conn:
         rows = conn.execute("SELECT id, title, workspace, parent_id, deleted_at FROM pages WHERE deleted_at IS NOT NULL ORDER BY deleted_at DESC").fetchall()
     return [{"id": r["id"], "name": r["title"] or "Untitled", "icon": "📄", "path": r["workspace"] or "Private", "deleted_at": r["deleted_at"]} for r in rows]
@@ -1052,7 +1052,7 @@ async def restore_page(request: Request, page_id: int):
 
 
 @router.delete("/api/trash/{page_id}")
-async def permanent_delete(request: Request, page_id: int):
+def permanent_delete(request: Request, page_id: int):
     with get_conn() as conn:
         conn.execute("UPDATE pages SET parent_id=NULL WHERE parent_id=?", (page_id,))
         conn.execute("DELETE FROM pages WHERE id=? AND deleted_at IS NOT NULL", (page_id,))
@@ -1061,7 +1061,7 @@ async def permanent_delete(request: Request, page_id: int):
 
 
 @router.get("/trash", response_class=HTMLResponse)
-async def trash_page(request: Request):
+def trash_page(request: Request):
     from app.templating import ENV
     env = ENV
     template = env.get_template("trash.html")
@@ -1072,7 +1072,7 @@ async def trash_page(request: Request):
 # These routes MUST be registered before the catch-all /{owner}/{repo} below.
 
 @router.get("/api/synced-blocks")
-async def list_synced_blocks_api(request: Request, workspace: str = Query(default="")):
+def list_synced_blocks_api(request: Request, workspace: str = Query(default="")):
     """List synced blocks for a workspace."""
     user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
     from app.services.synced_blocks import list_synced_blocks
@@ -1147,7 +1147,7 @@ async def delete_synced_block_api(request: Request, sid: int):
 
 
 @router.get("/api/synced-blocks/{sid}")
-async def get_synced_block_api(sid: int):
+def get_synced_block_api(sid: int):
     """Get a synced block by id."""
     from app.services.synced_blocks import get_synced_block
     sb = get_synced_block(sid)
@@ -1173,7 +1173,7 @@ async def add_synced_to_page(request: Request, page_id: int):
 
 
 @router.delete("/api/pages/{page_id}/synced/{sid}")
-async def remove_synced_from_page(request: Request, page_id: int, sid: int):
+def remove_synced_from_page(request: Request, page_id: int, sid: int):
     """Remove a synced block reference from a page (unsync)."""
     from app.services.synced_blocks import remove_page_synced
     remove_page_synced(page_id, sid)
@@ -1181,7 +1181,7 @@ async def remove_synced_from_page(request: Request, page_id: int, sid: int):
 
 
 @router.get("/api/pages/{page_id}/synced")
-async def get_page_synced_refs(request: Request, page_id: int):
+def get_page_synced_refs(request: Request, page_id: int):
     """Get all synced block references for a page."""
     from app.services.synced_blocks import get_page_synced
     return {"synced_blocks": get_page_synced(page_id)}
@@ -1190,7 +1190,7 @@ async def get_page_synced_refs(request: Request, page_id: int):
 # ═══════════ Board page ═══════════
 
 @router.get("/{owner}/{repo}", response_class=HTMLResponse)
-async def board(request: Request, owner: str, repo: str, view: str = Query(default="")):
+def board(request: Request, owner: str, repo: str, view: str = Query(default="")):
     from app.templating import ENV
     env = ENV
     sidebar = _sidebar_data(request, owner, repo)
@@ -1279,12 +1279,12 @@ async def board_view(
 # ═══════════ v0.9.0: Custom Properties API ═══════════
 
 @router.get("/api/properties/{owner}/{repo}")
-async def get_properties(owner: str, repo: str):
+def get_properties(owner: str, repo: str):
     return {"properties": _get_project_properties(owner, repo)}
 
 
 @router.post("/api/properties/{owner}/{repo}")
-async def create_property(owner: str, repo: str, name: str = Query(...),
+def create_property(owner: str, repo: str, name: str = Query(...),
                           prop_type: str = Query(default="select"),
                           options: str = Query(default="")):
     opts = json.dumps([o.strip() for o in options.split(",") if o.strip()])
@@ -1301,7 +1301,7 @@ async def create_property(owner: str, repo: str, name: str = Query(...),
 
 
 @router.delete("/api/properties/{owner}/{repo}")
-async def delete_property(owner: str, repo: str, name: str = Query(...)):
+def delete_property(owner: str, repo: str, name: str = Query(...)):
     with get_conn() as conn:
         conn.execute(
             "DELETE FROM project_properties WHERE project_owner=? AND project_name=? AND name=?",
@@ -1312,7 +1312,7 @@ async def delete_property(owner: str, repo: str, name: str = Query(...)):
 
 
 @router.post("/api/properties/{owner}/{repo}/values")
-async def set_property_value(owner: str, repo: str, issue_id: int = Query(...),
+def set_property_value(owner: str, repo: str, issue_id: int = Query(...),
                               name: str = Query(...), value: str = Query(default="")):
     with get_conn() as conn:
         prop = conn.execute(
@@ -1332,7 +1332,7 @@ async def set_property_value(owner: str, repo: str, issue_id: int = Query(...),
 # ═══════════ v0.9.0: AI Keywords API ═══════════
 
 @router.get("/api/ai-keywords/{owner}/{repo}")
-async def get_ai_keywords(owner: str, repo: str):
+def get_ai_keywords(owner: str, repo: str):
     with get_conn() as conn:
         rows = conn.execute(
             "SELECT keyword, color, usage_count FROM ai_keywords WHERE project_owner=? AND project_name=? ORDER BY usage_count DESC LIMIT 30",
@@ -1395,7 +1395,7 @@ async def create_page(request: Request, title: str = Query(default=""),
 
 
 @router.get("/api/pages/{page_id}")
-async def get_page(request: Request, page_id: int):
+def get_page(request: Request, page_id: int):
     """Get a Markdown page."""
     user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
     if not user or not user.get("id"):
@@ -1543,7 +1543,7 @@ def _block_texts(b: dict) -> list[str]:
 
 
 @router.get("/api/pages/{page_id}/backlinks")
-async def page_backlinks(request: Request, page_id: int):
+def page_backlinks(request: Request, page_id: int):
     """v5.4.0: pages that link to this one ("Lié depuis…").
 
     Scans every non-deleted page's blocks (and raw markdown) for an internal
@@ -1591,7 +1591,7 @@ async def page_backlinks(request: Request, page_id: int):
 
 
 @router.get("/api/pages/{page_id}/versions")
-async def page_versions(request: Request, page_id: int):
+def page_versions(request: Request, page_id: int):
     """v5.4.0: version history for a block-editor page."""
     with get_conn() as conn:
         rows = conn.execute(
@@ -1750,7 +1750,7 @@ async def set_page_cover(request: Request, page_id: int):
 
 
 @router.delete("/api/pages/{page_id}/cover")
-async def remove_page_cover(request: Request, page_id: int):
+def remove_page_cover(request: Request, page_id: int):
     with get_conn() as conn:
         conn.execute("UPDATE pages SET cover_url='' WHERE id=?", (page_id,))
         conn.commit()
@@ -2024,7 +2024,7 @@ async def delete_page(request: Request, page_id: int):
 
 
 @router.get("/pages/{page_id}", response_class=HTMLResponse)
-async def view_page(request: Request, page_id: int):
+def view_page(request: Request, page_id: int):
     """Render a page as HTML, or a file viewer for uploaded files.
     ?embed=1 — minimal mode for side peek (editor only, no header)."""
     embed = request.query_params.get("embed") == "1"