feat: local workspace — file/folder tree with CRUD, empty for local accounts

- /local-workspace: page with file tree for local accounts (no forge)
- API: GET/POST/PUT/DELETE /api/local-workspace/items
- Workspace is empty when no pages exist, shows create buttons
- File tree shows nested items with rename/delete actions
- Local accounts are NOT linked to Gitea (separate workspace space)

app/routers/dashboard.py

@@ -454,3 +454,82 @@ async def remove_member(request: Request, ws_id: int, user_id: int):
         )
         conn.commit()
     return {"status": "ok"}
+
+
+# ═══════════ Local Workspace (file/folder CRUD) ═══════════
+
+@router.get("/local-workspace", response_class=HTMLResponse)
+async def local_workspace_page(request: Request):
+    """Local workspace page with file/folder tree."""
+    from jinja2 import Environment, FileSystemLoader
+    env = Environment(loader=FileSystemLoader("app/templates"))
+    sidebar = _sidebar_data(request, [])
+    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+    if not user:
+        return RedirectResponse("/auth/login?provider=local", status_code=302)
+
+    with get_conn() as conn:
+        rows = conn.execute(
+            "SELECT id, title FROM pages WHERE parent_id IS NULL ORDER BY created_at DESC"
+        ).fetchall()
+    items = [{"id": r["id"], "name": r["title"] or "Untitled", "type": "page"} for r in rows]
+
+    ctx = {**sidebar, "user": user, "workspace_name": "My Workspace", "items": items}
+    template = env.get_template("local_workspace.html")
+    return template.render(**ctx)
+
+
+@router.get("/api/local-workspace/tree")
+async def local_workspace_tree(request: Request):
+    """Return the file/folder tree."""
+    with get_conn() as conn:
+        roots = conn.execute(
+            "SELECT id, title FROM pages WHERE parent_id IS NULL ORDER BY created_at DESC"
+        ).fetchall()
+    tree = []
+    for r in roots:
+        with get_conn() as conn:
+            children = conn.execute(
+                "SELECT id, title FROM pages WHERE parent_id=? ORDER BY created_at", (r["id"],)
+            ).fetchall()
+        item = {"id": r["id"], "name": r["title"] or "Untitled", "type": "page",
+                "children": [{"id": c["id"], "name": c["title"] or "Untitled", "type": "page"} for c in children]}
+        tree.append(item)
+    return {"tree": tree}
+
+
+@router.post("/api/local-workspace/items")
+async def create_local_workspace_item(request: Request):
+    """Create a new file."""
+    import json
+    body = await request.json()
+    name = body.get("name", "Untitled").strip()
+    with get_conn() as conn:
+        cursor = conn.execute(
+            "INSERT INTO pages (workspace, title, content, content_format, parent_section) VALUES ('', ?, '', 'blocks', 'Private')",
+            (name,),
+        )
+        conn.commit()
+        pid = cursor.lastrowid
+    return {"id": pid, "name": name, "type": "page"}
+
+
+@router.put("/api/local-workspace/items/{item_id:int}")
+async def rename_local_workspace_item(request: Request, item_id: int):
+    """Rename a file."""
+    import json
+    body = await request.json()
+    name = body.get("name", "Untitled").strip()
+    with get_conn() as conn:
+        conn.execute("UPDATE pages SET title=? WHERE id=?", (name, item_id))
+        conn.commit()
+    return {"status": "ok"}
+
+
+@router.delete("/api/local-workspace/items/{item_id:int}")
+async def delete_local_workspace_item(request: Request, item_id: int):
+    """Delete a file (and its children)."""
+    with get_conn() as conn:
+        conn.execute("DELETE FROM pages WHERE id=? OR parent_id=?", (item_id, item_id))
+        conn.commit()
+    return {"status": "ok"}