feat(deploy): production deployment setup and fixes

- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma
  binaryTargets for openssl 3.0
- nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal
  cron, http->https redirect
- prisma: add origin_goods.delisted migration, sync missing schema
  (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz
- api: CORS wildcard reflection, helmet CORP cross-origin, price
  backfill in persistProductDetail, categoryIcon ancestor fallback,
  mediaByColor per-color gallery in public goods detail
- admin: /admin base path (vite + router)
- import-data.mjs: udt_name casting, serial sequence advance fix

.agents/skills/supabase-postgres-best-practices/references/conn-pooling.md

@@ -1,41 +0,0 @@
----
-title: Use Connection Pooling for All Applications
-impact: CRITICAL
-impactDescription: Handle 10-100x more concurrent users
-tags: connection-pooling, pgbouncer, performance, scalability
----
-
-## Use Connection Pooling for All Applications
-
-Postgres connections are expensive (1-3MB RAM each). Without pooling, applications exhaust connections under load.
-
-**Incorrect (new connection per request):**
-
-```sql
--- Each request creates a new connection
--- Application code: db.connect() per request
--- Result: 500 concurrent users = 500 connections = crashed database
-
--- Check current connections
-select count(*) from pg_stat_activity;  -- 487 connections!
-```
-
-**Correct (connection pooling):**
-
-```sql
--- Use a pooler like PgBouncer between app and database
--- Application connects to pooler, pooler reuses a small pool to Postgres
-
--- Configure pool_size based on: (CPU cores * 2) + spindle_count
--- Example for 4 cores: pool_size = 10
-
--- Result: 500 concurrent users share 10 actual connections
-select count(*) from pg_stat_activity;  -- 10 connections
-```
-
-Pool modes:
-
-- **Transaction mode**: connection returned after each transaction (best for most apps)
-- **Session mode**: connection held for entire session (needed for prepared statements, temp tables)
-
-Reference: [Connection Pooling](https://supabase.com/docs/guides/database/connecting-to-postgres#connection-pooler)