feat: Phase 2C — notes & todos

- New models: SiteNote, SiteTodo (site_notes, site_todos tables)
- New schemas: NoteOut, TodoOut with creator/done-by name enrichment
- New router: /api/notes/ — full CRUD for notes and todos
  - Notes: create, list (pinned first), update (body + pin), delete
  - Todos: create, list (undone high-priority first), toggle done, edit, delete
  - Marking done records done_at + done_by_id; unchecking clears both
- Migrations: CREATE TABLE IF NOT EXISTS for both tables (additive, safe)
- NotesPage.jsx: two-column layout — notes left, todos right
  - Notes: inline click-to-edit, pin toggle, Ctrl+Enter to save, pinned section on top
  - Todos: inline edit, high-priority flag, completed collapse toggle
- /notes route added to App.jsx
- NotebookPen sidebar entry between Διαχείριση and Ρυθμίσεις

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/main.py

@@ -20,6 +20,7 @@ import models.settings      # noqa: F401
 import models.flag          # noqa: F401 — registers TableFlagDef, TableFlagAssignment
 import models.message       # noqa: F401 — registers StaffMessage, StaffMessageAck, QuickMessageTemplate
 import models.reservation   # noqa: F401
+import models.notes          # noqa: F401 — registers SiteNote, SiteTodo
 
 from routers import auth, tables, products, orders, waiters, reports, system, setup as setup_router
 from routers import business_day as business_day_router
@@ -31,6 +32,7 @@ from routers import sse as sse_router
 from routers import data_transfer as data_transfer_router
 from routers import connect_orders as connect_orders_router
 from routers import reservations as reservations_router
+from routers import notes as notes_router
 
 
 def _run_migrations():
@@ -269,6 +271,25 @@ def _run_migrations():
         # Phase 2B — staff payroll
         "ALTER TABLE users ADD COLUMN hourly_rate REAL",
         "ALTER TABLE waiter_shifts ADD COLUMN hourly_rate_snapshot REAL",
+        # Phase 2C — notes & todos
+        """CREATE TABLE IF NOT EXISTS site_notes (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            body TEXT NOT NULL,
+            created_by_id INTEGER NOT NULL REFERENCES users(id),
+            created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+            updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+            is_pinned INTEGER NOT NULL DEFAULT 0
+        )""",
+        """CREATE TABLE IF NOT EXISTS site_todos (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            body TEXT NOT NULL,
+            is_done INTEGER NOT NULL DEFAULT 0,
+            done_at DATETIME,
+            done_by_id INTEGER REFERENCES users(id),
+            created_by_id INTEGER NOT NULL REFERENCES users(id),
+            created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+            priority VARCHAR NOT NULL DEFAULT 'normal'
+        )""",
     ]
     for sql in migrations:
         try:
@@ -331,3 +352,4 @@ app.include_router(sse_router.router,            prefix="/api/sse",          tag
 app.include_router(data_transfer_router.router,  prefix="/api/data-transfer", tags=["data-transfer"])
 app.include_router(connect_orders_router.router, prefix="/api/connect",      tags=["connect"])
 app.include_router(reservations_router.router,   prefix="/api/reservations", tags=["reservations"])
+app.include_router(notes_router.router,          prefix="/api/notes",        tags=["notes"])