Phase 2.1: Card mirror system for deckbuilding features

- Created MtgCardMirror and DeckCardLink models in mirror_models.py
- Created card_mirror_service.py with sync_mirrors functionality
- Added sync_mirrors() method to mtgjson_manager.py
- Added mirror_get_db() dependency to database.py
- Added DecklistFile.status column (DRAUGHT/FINAL)
- Updated DeckCreate schema with status field
- Added DeckWithCardsResponse schema with card_count
- Updated deck router to query card mirrors and return card counts
- Added plain text deck content support

backend/app/models/__init__.py

@@ -1 +1,19 @@
-# Models package
+# Models package
+from app.models.models import User, DecklistFile, DecklistFolder, Room, RoomGameType, Ban, GameLog, AuditLog
+from app.models.mtg_models import MtgSet, MtgCard
+from app.models.mirror_models import MtgCardMirror, DeckCardLink
+
+__all__ = [
+    "User",
+    "DecklistFile",
+    "DecklistFolder",
+    "Room",
+    "RoomGameType",
+    "Ban",
+    "GameLog",
+    "AuditLog",
+    "MtgSet",
+    "MtgCard",
+    "MtgCardMirror",
+    "DeckCardLink",
+]