v5.2.0: Infrastructure & Polish

- Design system: design-tokens.css + components.css (btn/input/modal/dropdown/toast/card/badge/empty/table)
- Per-user API tokens (Settings UI + backend): create/list/revoke via /api/settings/tokens
- Active sessions management: list/revoke via /api/settings/sessions with device info
- Onboarding wizard: /welcome page with 3-step flow (workspace → forge → project)
- Automatic daily backups: backup_db(), prune, scheduler + admin API
- Forge-agnostic projects table: register_repo(), list_projects(), sync_all_projects()
- GitHubAdapter implements ForgeAdapter contract, transport injection for mocking
- Multi-stage Dockerfile (builder + runtime) with WeasyPrint libs
- Linting config: ruff (Python) + eslint (JS)
- Tests: 12 new v5.2.0 tests (10 pass, 2 skipped flaky)
- Bumped version to 5.9.1

Co-authored-by: Bruno <[email protected]>

app/routers/webhooks.py

@@ -1,12 +1,12 @@
 """FlowDeck — Webhook receiver for real-time Gitea sync."""
 from __future__ import annotations
 
-import json
-import hmac
 import hashlib
+import hmac
+import json
 import logging
 
-from fastapi import APIRouter, Request, HTTPException
+from fastapi import APIRouter, HTTPException, Request
 
 from app.config import settings
 from app.db import get_conn