Nozzle-aware AMS mapping for dual-nozzle printers, BL spool detection fix, AMS startup fix, SQLite WAL (#318)

Dual-nozzle H2D/H2D Pro: filament matching now respects nozzle assignments
from the 3MF file. Each AMS unit feeds a specific nozzle (L/R), and the
scheduler/frontend constrain matching to only trays on the correct nozzle.
Falls back to unfiltered matching when no trays exist on the target nozzle.
L/R badges shown in the filament mapping UI. Translated in en/de/ja/it.

Fix AMS slot config overwritten on startup: on_ams_change unconditionally
unlinked BL spool assignments on every MQTT pushall, then re-assigned them
sending ams_filament_setting without setting_id — clearing the printer's
filament preset. Now compares spool RFID identifiers before unlinking.

Fix BL spool detection false positives: removed tray_info_idx from detection
logic in both backend is_bambu_lab_spool() and frontend isBambuLabSpool().
Third-party spools using Bambu generic presets had GF-prefixed tray_info_idx
values, causing misidentification. Now uses only tray_uuid and tag_uid.

SQLite WAL mode with 5s busy timeout reduces "database is locked" errors.

.gitignore

@@ -28,6 +28,8 @@ npm-debug.log*
 # Database
 *.db
 *.db-journal
+*.db-wal
+*.db-shm
 
 # Archive files (user data)
 archive/