feat(inventory): Qwen vehicle compatibility — store AI unmatched vehicles as text, Celery background sync, fix brand filter fallback, increase vehicle limits

pos/migrations/v3.2_qwen_vehicle_compat.sql

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+-- v3.2 QWEN Vehicle Compatibility — store unmatched AI vehicles as text
+-- Allows saving QWEN fitment results even when the vehicle is not in TecDoc.
+
+-- 1. Allow NULL model_year_engine_id for QWEN vehicles not in master DB
+ALTER TABLE inventory_vehicle_compat
+    ALTER COLUMN model_year_engine_id DROP NOT NULL;
+
+-- 2. Add text columns for QWEN vehicle details
+ALTER TABLE inventory_vehicle_compat
+    ADD COLUMN IF NOT EXISTS make VARCHAR(100),
+    ADD COLUMN IF NOT EXISTS model VARCHAR(100),
+    ADD COLUMN IF NOT EXISTS year INTEGER,
+    ADD COLUMN IF NOT EXISTS engine VARCHAR(100),
+    ADD COLUMN IF NOT EXISTS engine_code VARCHAR(50);
+
+-- 3. Drop old unique constraint and recreate to handle NULL mye_id
+-- (PostgreSQL allows multiple NULLs in a UNIQUE constraint)
+ALTER TABLE inventory_vehicle_compat
+    DROP CONSTRAINT IF EXISTS inventory_vehicle_compat_inventory_id_model_year_engine_id_key;
+
+ALTER TABLE inventory_vehicle_compat
+    ADD CONSTRAINT inventory_vehicle_compat_unique_match
+    UNIQUE (inventory_id, model_year_engine_id, make, model, year);
+
+-- 4. Index for fast filtering by inventory + text vehicles
+CREATE INDEX IF NOT EXISTS idx_ivc_text_vehicle
+    ON inventory_vehicle_compat(inventory_id, make, model, year)
+    WHERE model_year_engine_id IS NULL;
+
+-- 5. Update view to include new columns
+DROP VIEW IF EXISTS v_inventory_vehicle_compat;
+CREATE VIEW v_inventory_vehicle_compat AS
+SELECT
+    ivc.id,
+    ivc.inventory_id,
+    ivc.model_year_engine_id,
+    ivc.make,
+    ivc.model,
+    ivc.year,
+    ivc.engine,
+    ivc.engine_code,
+    ivc.source,
+    ivc.confidence,
+    ivc.created_at,
+    i.part_number,
+    i.name as item_name,
+    i.brand as item_brand,
+    i.price_1,
+    i.price_2,
+    i.price_3,
+    i.image_url
+FROM inventory_vehicle_compat ivc
+JOIN inventory i ON i.id = ivc.inventory_id;