feat: entity relationship refactor — notification trackers, command system, chat actions

Rework entity schema: rename Tracker→NotificationTracker, add CommandConfig/
CommandTracker/CommandTrackerListener entities for decoupled command handling.
Commands now resolve through CommandTracker→CommandConfig instead of
TelegramBot.commands_config. Smart ref-counted bot polling based on active
listeners. Add chat_action to telegram targets. Full frontend CRUD pages
for command configs and command trackers. Idempotent SQLite migrations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/server/src/notify_bridge_server/api/status.py

@@ -8,7 +8,7 @@ from sqlmodel.ext.asyncio.session import AsyncSession
 
 from ..auth.dependencies import get_current_user
 from ..database.engine import get_session
-from ..database.models import NotificationTarget, ServiceProvider, Tracker, EventLog, User
+from ..database.models import NotificationTarget, NotificationTracker, ServiceProvider, EventLog, User
 
 router = APIRouter(prefix="/api/status", tags=["status"])
 
@@ -31,7 +31,7 @@ async def get_status(
     )).one()
 
     trackers_result = await session.exec(
-        select(Tracker).where(Tracker.user_id == user.id)
+        select(NotificationTracker).where(NotificationTracker.user_id == user.id)
     )
     trackers = trackers_result.all()
     active_count = sum(1 for t in trackers if t.enabled)
@@ -43,8 +43,8 @@ async def get_status(
     # Build events query with filters
     events_query = (
         select(EventLog)
-        .join(Tracker, EventLog.tracker_id == Tracker.id)
-        .where(Tracker.user_id == user.id)
+        .join(NotificationTracker, EventLog.tracker_id == NotificationTracker.id)
+        .where(NotificationTracker.user_id == user.id)
     )
 
     if event_type:
@@ -110,8 +110,8 @@ async def get_event_chart(
             EventLog.event_type,
             func.count().label("total"),
         )
-        .join(Tracker, EventLog.tracker_id == Tracker.id)
-        .where(Tracker.user_id == user.id, EventLog.created_at >= cutoff)
+        .join(NotificationTracker, EventLog.tracker_id == NotificationTracker.id)
+        .where(NotificationTracker.user_id == user.id, EventLog.created_at >= cutoff)
         .group_by(day_col, EventLog.event_type)
         .order_by(day_col)
     )