支持已绑定设备追加 NFC 卡

- 新增已绑定设备追加卡会话和小程序入口

- 允许同设备多张 active 卡，保留 card_uuid 唯一并补齐老库迁移

- 收紧未知卡自动绑定和跨设备卡复用

验证：talkingq-url/.venv/bin/python -m pytest tests；compileall；npm run build:weapp

talkingq-url/database/init_db.py

@@ -106,6 +106,61 @@ async def _ensure_child_location_address_columns(conn) -> None:
     )
 
 
+async def _ensure_bind_session_card_columns(conn) -> None:
+    await _ensure_columns(
+        conn,
+        table_name="device_bind_sessions",
+        columns=[
+            ("bind_mode", "bind_mode TINYINT NOT NULL DEFAULT 1 AFTER status"),
+            ("card_uuid", "card_uuid VARCHAR(64) NULL AFTER bind_mode"),
+        ],
+    )
+
+    result = await conn.execute(
+        text(
+            """
+            SELECT COUNT(*)
+            FROM INFORMATION_SCHEMA.STATISTICS
+            WHERE TABLE_SCHEMA = DATABASE()
+              AND TABLE_NAME = 'device_bind_sessions'
+              AND INDEX_NAME = 'idx_device_bind_sessions_card_uuid'
+            """
+        )
+    )
+    if int(result.scalar() or 0) == 0:
+        await conn.execute(text("ALTER TABLE device_bind_sessions ADD INDEX idx_device_bind_sessions_card_uuid (card_uuid)"))
+
+
+async def _ensure_cards_allow_multiple_per_device(conn) -> None:
+    result = await conn.execute(
+        text(
+            """
+            SELECT COUNT(*)
+            FROM INFORMATION_SCHEMA.STATISTICS
+            WHERE TABLE_SCHEMA = DATABASE()
+              AND TABLE_NAME = 'cards'
+              AND INDEX_NAME = 'idx_cards_device_id'
+            """
+        )
+    )
+    if int(result.scalar() or 0) == 0:
+        await conn.execute(text("ALTER TABLE cards ADD INDEX idx_cards_device_id (device_id)"))
+
+    result = await conn.execute(
+        text(
+            """
+            SELECT COUNT(*)
+            FROM INFORMATION_SCHEMA.STATISTICS
+            WHERE TABLE_SCHEMA = DATABASE()
+              AND TABLE_NAME = 'cards'
+              AND INDEX_NAME = 'uq_cards_device_id'
+            """
+        )
+    )
+    if int(result.scalar() or 0) > 0:
+        await conn.execute(text("ALTER TABLE cards DROP INDEX uq_cards_device_id"))
+
+
 async def _ensure_device_family_tables(conn) -> None:
     await conn.execute(
         text(
@@ -222,6 +277,8 @@ async def init_db():
             await _ensure_schedule_suppressed_until_column(conn)
             await _ensure_device_alarm_location_columns(conn)
             await _ensure_child_location_address_columns(conn)
+            await _ensure_bind_session_card_columns(conn)
+            await _ensure_cards_allow_multiple_per_device(conn)
             await _ensure_device_family_tables(conn)
         await engine.dispose()
         session_logger.info("system", "database", "数据库表已成功创建")