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/projects.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.services import projects as projects_svc
@@ -29,9 +29,8 @@ def list_projects(request: Request):
 
 
 @router.post("")
-async def create_project(request: Request):
+def create_project(request: Request, body: dict = Body(default={})):
     """Register a standalone (builtin) project."""
-    body = await request.json()
     name = (body.get("name") or "").strip()
     if not name:
         raise HTTPException(status_code=400, detail="name required")
@@ -51,7 +50,7 @@ async def sync_projects(request: Request):
 
 
 @backups_router.post("/api/settings/backups/run")
-async def run_backup_now(request: Request):
+def run_backup_now(request: Request):
     """Admin: create a database backup immediately."""
     _require_admin(request)
     filename = backup_db()
@@ -61,7 +60,7 @@ async def run_backup_now(request: Request):
 
 
 @backups_router.get("/api/settings/backups")
-async def admin_list_backups(request: Request):
+def admin_list_backups(request: Request):
     """Admin: list stored backups."""
     _require_admin(request)
     return {"backups": list_backups()}