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/notifications.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 
 import logging
 
-from fastapi import APIRouter, HTTPException, Request
+from fastapi import APIRouter, Body, HTTPException, Request
 
 from app.auth.session import SessionManager
 from app.db import get_conn
@@ -56,10 +56,9 @@ def unread_count(request: Request):
 
 
 @router.post("/read")
-async def mark_read(request: Request):
+def mark_read(request: Request, body: dict = Body(default={})):
     """Mark one notification as read (id) or all (id omitted)."""
     user = _current_user(request)
-    body = await request.json() if request.headers.get("content-type") else {}
     nid = body.get("id")
     with get_conn() as conn:
         if nid:
@@ -91,11 +90,10 @@ def get_prefs(request: Request):
 
 
 @router.post("/prefs")
-async def set_prefs(request: Request):
+def set_prefs(request: Request, body: dict = Body(default={})):
     """Update the current user's notification email preferences."""
     user = _current_user(request)
     from app.services import notifications as notif
-    body = await request.json() if request.headers.get("content-type") else {}
     prefs = notif.get_user_prefs(user["id"])
     for key in ("comments", "mentions", "reminders", "assignments"):
         if key in body:
@@ -116,10 +114,9 @@ def get_timezone(request: Request):
 
 
 @router.post("/timezone")
-async def set_timezone(request: Request):
+def set_timezone(request: Request, body: dict = Body(default={})):
     """Update the current user's IANA timezone (empty string = UTC)."""
     user = _current_user(request)
-    body = await request.json() if request.headers.get("content-type") else {}
     tz = (body.get("timezone") or "").strip()
     from app.services.recurrence import is_valid_timezone
     if tz and not is_valid_timezone(tz):