feat: locale-aware command templates, debounced auto-sync, entity pickers

- Locale-aware templates: CommandTemplateSlot now has a locale column,
  allowing each slot to have per-language variants (EN/RU). Templates
  are resolved at runtime from the Telegram user's language_code.

- Merged system configs: "Default Commands (EN)" and "(RU)" merged
  into a single "Default Commands" config with locale-aware slots.
  Migration handles existing data automatically.

- Configurable command descriptions: hardcoded COMMAND_DESCRIPTIONS
  replaced with desc_* template slots (desc_status, desc_help, etc.)
  that users can customize per locale. setMyCommands registers all
  locales explicitly.

- Removed locale from CommandConfig: no longer needed since locale
  is derived from the Telegram user's language at runtime.

- Debounced command auto-sync: after command config/tracker changes,
  affected bots are marked dirty and synced after a 30s debounce
  window. Manual "Sync with Telegram" button still works.

- Entity pickers in LinkedTargetsSection: replaced 6 plain <select>
  elements with EntitySelect components (search, icons, keyboard nav).
  Added onselect callback and size="sm" props to EntitySelect.

packages/server/src/notify_bridge_server/commands/registry.py

@@ -1,27 +1,7 @@
-"""Command definitions — descriptions, categories, and rate limit grouping."""
+"""Command definitions — categories, rate limit grouping, and defaults."""
 
 from __future__ import annotations
 
-# Command descriptions for Telegram menu (EN / RU)
-COMMAND_DESCRIPTIONS: dict[str, dict[str, str]] = {
-    "status":    {"en": "Show tracker status", "ru": "Показать статус трекеров"},
-    "albums":    {"en": "List tracked albums", "ru": "Список отслеживаемых альбомов"},
-    "events":    {"en": "Show recent events", "ru": "Показать последние события"},
-    "summary":   {"en": "Send album summary now", "ru": "Отправить сводку альбомов"},
-    "latest":    {"en": "Show latest photos", "ru": "Показать последние фото"},
-    "memory":    {"en": "On This Day memories", "ru": "Воспоминания за этот день"},
-    "random":    {"en": "Send random photo", "ru": "Отправить случайное фото"},
-    "search":    {"en": "Smart search (AI)", "ru": "Умный поиск (AI)"},
-    "find":      {"en": "Search by filename", "ru": "Поиск по имени файла"},
-    "person":    {"en": "Find photos of person", "ru": "Найти фото человека"},
-    "place":     {"en": "Find photos by location", "ru": "Найти фото по месту"},
-    "favorites": {"en": "Show favorites", "ru": "Показать избранное"},
-    "people":    {"en": "List detected people", "ru": "Список людей"},
-    "help":      {"en": "Show available commands", "ru": "Показать доступные команды"},
-}
-
-ALL_COMMANDS = list(COMMAND_DESCRIPTIONS.keys())
-
 # Map commands to rate limit categories
 _RATE_CATEGORY: dict[str, str] = {
     "search": "search", "find": "search", "person": "search",
@@ -35,7 +15,6 @@ def get_rate_category(cmd: str) -> str:
 
 DEFAULT_COMMANDS_CONFIG = {
     "enabled": ["help", "status", "albums", "events", "latest", "random", "favorites", "summary", "memory"],
-    "locale": "en",
     "response_mode": "media",
     "default_count": 5,
     "rate_limits": {"search": 30, "default": 10},