feat(automations): moteur de regles if-this-then-that (v5.1.0 roadmap, bump v5.2.0)

Moteur d'automatisation complet : declencheurs (evenement / cron / bouton),
conditions combinables (eq, neq, contains, is_empty, is_not_empty, changed)
et actions (webhook, set_property, create_page, notify).

- Migration v5 : tables `automations` + `automation_runs` (avec index).
- Service `app/services/automations.py` : fire_event, cron_due (`*/N`,
  minute fixe, @hourly/@daily), scheduler de fond dans le lifespan.
- Router `app/routers/automations.py` : CRUD `/workspace/automations`,
  historique des executions, run manuel + run bouton `/api/automations/{id}/run`
  (exempt CSRF, comme `/api/agent`).
- Hooks d'evenements dans collections.py / board.py / workspace.py
  (collection.* et page.* : created/updated/deleted/moved).
- Bloc `button` dans l'editeur (menu slash) : declenche une regle au clic,
  picker d'automation inline, serialisation automations_id/name.
- Panneau Automations dans le Settings (creer/editer/activer/desactiver/
  lancer/supprimer + historique), collection scope + JSON conditions/actions.
- 11 tests `tests/test_automations.py` ; suite complete pytest 289 verte.
- Version bump 5.2.0 (VERSION, app/main.py, CHANGELOG).

app/routers/board.py

@@ -10,8 +10,9 @@ from fastapi.responses import HTMLResponse, JSONResponse
 from app.db import get_conn
 from app.services.gitea_client import gitea
 from app.auth.session import SessionManager
-from app.routers.sidebar_config import get_sidebar_config_sync
 from app.routers.dashboard import _get_app_version
+from app.routers.sidebar_config import get_sidebar_config_sync
+from app.services.automations import fire_event
 
 logger = logging.getLogger(__name__)
 router = APIRouter(tags=["board"], prefix="/board")
@@ -836,6 +837,8 @@ async def create_page(request: Request, title: str = Query(default=""),
             )
             conn.commit()
             page_id = cur.lastrowid
+        await fire_event("page.created", {"page_id": page_id, "title": page_title,
+                                          "workspace": ws_key, "parent_id": parent_id})
         return {"status": "ok", "id": page_id, "title": page_title, "workspace": ws_key, "parent_id": parent_id}
     except Exception as e:
         logger.error("create_page failed: %s", e)
@@ -866,6 +869,8 @@ async def update_page(request: Request, page_id: int, title: str = Query(default
         if content_format:
             conn.execute("UPDATE pages SET content_format=?, updated_at=CURRENT_TIMESTAMP WHERE id=?", (content_format, page_id))
         conn.commit()
+    await fire_event("page.updated", {"page_id": page_id, "title": title,
+                                      "content_format": content_format or "markdown"})
     return {"status": "ok"}
 
 
@@ -886,6 +891,8 @@ async def save_page_blocks(request: Request, page_id: int):
             (blocks_json, page_id),
         )
         conn.commit()
+    await fire_event("page.updated", {"page_id": page_id, "title": title or "",
+                                      "content_format": "blocks"})
     return {"status": "ok", "id": page_id}
 
 
@@ -932,6 +939,8 @@ async def move_page(request: Request, page_id: int):
             )
         
         conn.commit()
+    await fire_event("page.moved", {"page_id": page_id, "workspace_id": new_ws_id or 0,
+                                    "parent_id": new_parent_id})
     return {"status": "ok", "id": page_id}
 
 
@@ -945,6 +954,7 @@ async def delete_page(request: Request, page_id: int):
         import datetime
         conn.execute("UPDATE pages SET deleted_at=? WHERE id=?", (datetime.datetime.utcnow().isoformat(), page_id,))
         conn.commit()
+    await fire_event("page.deleted", {"page_id": page_id, "title": row["title"] or ""})
     return {"status": "ok", "deleted": page_id, "title": row["title"]}