feat(catalog): supplier catalog cleanup, fuzzy matching, and navigation fixes

- Cleaned 137+ fake engine-displacement models from supplier imports
  (v3/v4 scripts: Chevrolet, Ford, Chrysler, Dodge, Jeep, Nissan, etc.)
- Removed 1,251+ corrupted models (INT. prefixes, year-suffix, torque specs,
  empty names, trailing-year variants)
- Migrated supplier tables to master DB (supplier_catalog,
  supplier_catalog_compat, supplier_catalog_interchange)
- Fixed _get_mye_ids_with_parts() to query supplier_catalog_compat from
  master DB so supplier-only vehicles appear for all tenants
- Added fuzzy model matcher with parenthesis stripping, noise suffix removal,
  compact matching, prefix/substring fallback, model aliases, and ±3 year
  proximity
- Matched compat rows: KEEP GREEN +14,152, KNADIAN +3,021, VAZLO +127,500,
  LUK +477, RAYBESTOS +1,743
- Added KNADIAN catalog importer with year-range expansion and future-year
  filtering
- Added VAZLO catalog importer with position parsing and SKU-in-model cleanup
- Added Keep Green, LUK, Yokomitsu, Raybestos catalog importers
- Cache clearing after cleanups (_classify_cache_*, nexus:mye_ids:*,
  nexus:brand_mye_counts:*)

Final match rates:
- KEEP GREEN: 90.3%
- VAZLO: 93.6%
- YOKOMITSU: 100.0%
- KNADIAN: 57.4%
- LUK: 51.0%
- RAYBESTOS: 55.9%

pos/migrations/v3.5_meli_questions.sql

@@ -0,0 +1,30 @@
+-- ============================================================
+-- v3.5 MercadoLibre Questions & Answers
+-- ============================================================
+-- Adds table for tracking buyer questions on ML listings.
+-- All tables live in the tenant DB.
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS marketplace_questions (
+    id                      SERIAL PRIMARY KEY,
+    listing_id              INTEGER REFERENCES marketplace_listings(id) ON DELETE SET NULL,
+    external_question_id    VARCHAR(50) NOT NULL UNIQUE,
+    external_item_id        VARCHAR(50) NOT NULL,
+    question_text           TEXT NOT NULL,
+    answer_text             TEXT,
+    status                  VARCHAR(20) DEFAULT 'unanswered',  -- unanswered, answered, closed
+    buyer_id                VARCHAR(50),
+    buyer_nickname          VARCHAR(100),
+    question_date           TIMESTAMPTZ,
+    answer_date             TIMESTAMPTZ,
+    raw_json                JSONB,
+    created_at              TIMESTAMPTZ DEFAULT NOW(),
+    updated_at              TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_marketplace_questions_status
+    ON marketplace_questions(status);
+CREATE INDEX IF NOT EXISTS idx_marketplace_questions_listing
+    ON marketplace_questions(listing_id);
+CREATE INDEX IF NOT EXISTS idx_marketplace_questions_external
+    ON marketplace_questions(external_question_id);