feat(pricing): kit/pachet pricing with price list lookup, replace procent_pret

- Oracle PL/SQL: kit pricing logic with Mode A (distributed discount) and
  Mode B (separate discount line), dual policy support, PRETURI_CU_TVA flag
- Eliminate procent_pret from entire stack (Oracle, Python, JS, HTML)
- New settings: kit_pricing_mode, kit_discount_codmat, price_sync_enabled
- Settings UI: cards for Kit Pricing and Price Sync configuration
- Mappings UI: kit badges with lazy-loaded component prices from price list
- Price sync from orders: auto-update ROA prices when web prices differ
- Catalog price sync: new service to sync all GoMag product prices to ROA
- Kit component price validation: pre-check prices before import
- New endpoint GET /api/mappings/{sku}/prices for component price display
- New endpoints POST /api/price-sync/start, GET status, GET history
- DDL script 07_drop_procent_pret.sql (run after deploy confirmation)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/database.py

@@ -152,6 +152,18 @@ CREATE TABLE IF NOT EXISTS app_settings (
     value TEXT
 );
 
+CREATE TABLE IF NOT EXISTS price_sync_runs (
+    run_id          TEXT PRIMARY KEY,
+    started_at      TEXT,
+    finished_at     TEXT,
+    status          TEXT DEFAULT 'running',
+    products_total  INTEGER DEFAULT 0,
+    matched         INTEGER DEFAULT 0,
+    updated         INTEGER DEFAULT 0,
+    errors          INTEGER DEFAULT 0,
+    log_text        TEXT
+);
+
 CREATE TABLE IF NOT EXISTS order_items (
     order_number   TEXT,
     sku            TEXT,