feat: v4.0.1 — onboarding, landing page, smart redirect, register GET, 404 stylé, API unifiée

- Landing page / pour visiteurs non-auth (template landing.html)
- Redirection / intelligente: non-auth → landing, auth sans Gitea → local workspace, auth+Gitea → dashboard
- GET /auth/register — page d'inscription dédiée (tab register actif)
- 404 handler stylisé thème Notion sombre (JSON pour /api/*, HTML pour le reste)
- Alias /api/pages GET/POST → /board/api/pages (307 redirect)
- 133 tests passent

app/routers/auth.py

@@ -85,6 +85,27 @@ async function handleLogin(e){e.preventDefault();const email=document.getElement
 </html>"""
 
 
+@router.get("/register")
+async def register_page(request: Request):
+    """Show the registration page (local login page with register tab active)."""
+    return HTMLResponse(LOCAL_LOGIN_HTML.replace(
+        'class="tab active" onclick="switchTab(\'login\')"',
+        'class="tab" onclick="switchTab(\'login\')"'
+    ).replace(
+        'class="tab" onclick="switchTab(\'register\')"',
+        'class="tab active" onclick="switchTab(\'register\')"'
+    ).replace(
+        'let mode=\'login\';',
+        'let mode=\'register\';'
+    ).replace(
+        'id="name-group" style="display:none"',
+        'id="name-group" style="display:block"'
+    ).replace(
+        'id="submit-btn">Login<',
+        'id="submit-btn">Register<'
+    ), status_code=200)
+
+
 @router.get("/login")
 async def login(request: Request, provider: str = Query("gitea")):
     """Redirect to OAuth2 authorize page or show local login page."""

app/routers/dashboard.py

@@ -404,11 +404,29 @@ async def dashboard(
     search: str = Query(default=""),
     show_archived: bool = Query(default=False),
 ):
-    auth = _get_user_or_redirect(request)
-    if isinstance(auth, RedirectResponse):
-        return auth
-    # Check if user has Gitea connected — if not, show local workspace
-    user_id = auth.get("id") if isinstance(auth, dict) else 1
+    """Smart root route: landing for visitors, local workspace for new users, dashboard for Gitea users."""
+    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+
+    # ── Not authenticated → show landing page ──
+    if not user:
+        # Allow through if DB is empty (fresh install)
+        try:
+            with get_conn() as conn:
+                count = conn.execute("SELECT COUNT(*) FROM users").fetchone()[0]
+                if count == 0:
+                    from jinja2 import Environment, FileSystemLoader
+                    env = Environment(loader=FileSystemLoader("app/templates"))
+                    template = env.get_template("landing.html")
+                    return template.render()
+        except Exception:
+            pass
+        from jinja2 import Environment, FileSystemLoader
+        env = Environment(loader=FileSystemLoader("app/templates"))
+        template = env.get_template("landing.html")
+        return template.render()
+
+    # ── Authenticated ──
+    user_id = user.get("id", 1)
     has_gitea = False
     try:
         with get_conn() as conn:
@@ -419,8 +437,9 @@ async def dashboard(
             has_gitea = bool(tok)
     except Exception:
         pass
+
     if not has_gitea:
-        # Check if user has any workspace — if not, send to workspaces
+        # Check if user has any workspace
         try:
             with get_conn() as conn:
                 ws_count = conn.execute(
@@ -431,6 +450,8 @@ async def dashboard(
         except Exception:
             pass
         return RedirectResponse("/local-workspace", status_code=302)
+
+    # ── Gitea user → full dashboard ──
     try:
         repos = await gitea.get_user_repos(page=1, limit=50)
         if search: