fix: A21 phase 2c — 190 routes hors loop, 86 % total (v7.26.0)

4 passes (283 → 93 routes async sur 667 = 86 % hors loop, avant 61 %) :

A. RACINE AUTH — `get_current_user` (auth/session.py) était `async def`
   SANS aucun await (cookie decode = synchrone) ; idem ses clones :
   `agent._current_user_id/_workspace_id/_current_admin` (34 sites) et
   `sso._require_admin` (corps 0 await, 6 sites) → `def` +
   47 `await` supprimés. Piège : 3 call sites passaient par l'alias `gcu`
   (grep littéral aveugle) — 8 tests en échec → corrigés.

B. Re-scan : 19 routes devenues SANS await → `def` (agent 8, sso 5,
   web_clipper 3, projects 2, auth 1…).

C/D. 155 routes dont les seuls awaits = `request.json()` / événements :
   - try/except `body = {}` → `Body(default={})` (même tolérance)
   - try/except `raise HTTPException(400)` → `Body(...)` REQUIS
     (422 FastAPI — aucun test ne couvrait le 400)
   - forme conditionnelle `request.json() if content-type else {}`
     (54 sites) → défaut `{}` (sans corps = `{}` dans les 2 cas)
   - `await fire_*` → `run_event_sync(...)` ; imports `Body` /
     `run_event_sync` ajoutés aux routers convertis

Reste async (93, justifié) : form/upload/file (22), réseau gitea/llm/oidc,
`_json_body` (9), 2 JSON inline en argument, 1 fallback logique
(capture_frontend_error), 1 lecture conditionnelle (web_clipper), mixtes.

suite **1089/1089** · ruff OK · docs à jour

app/routers/workers.py

@@ -1,7 +1,7 @@
 """FlowDeck — Workers API (v7.0.0): CRUD, manual run, history, fork, usage."""
 from __future__ import annotations
 
-from fastapi import APIRouter, HTTPException, Request
+from fastapi import APIRouter, Body, HTTPException, Request
 from fastapi.responses import JSONResponse
 
 from app.auth.session import SessionManager
@@ -41,12 +41,8 @@ def _row_to_api(row) -> dict:
 
 
 @router.post("/api/v2/workers")
-async def create_worker(request: Request):
+def create_worker(request: Request, body: dict = Body(default={})):
     user = _auth_user(request, require_write=True)
-    try:
-        body = await request.json()
-    except Exception:
-        body = {}
     name = (body.get("name") or "Untitled worker").strip()[:200]
     code = body.get("code_py") or ""
     try:
@@ -101,12 +97,8 @@ def get_worker(worker_id: int, request: Request):
 
 
 @router.patch("/api/v2/workers/{worker_id}")
-async def update_worker(worker_id: int, request: Request):
+def update_worker(worker_id: int, request: Request, body: dict = Body(default={})):
     user = _auth_user(request, require_write=True)
-    try:
-        body = await request.json()
-    except Exception:
-        body = {}
     with get_conn() as conn:
         row = conn.execute("SELECT * FROM workers WHERE id=?", (worker_id,)).fetchone()
         if not row: