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-limits.md

@@ -1,44 +0,0 @@
----
-title: Set Appropriate Connection Limits
-impact: CRITICAL
-impactDescription: Prevent database crashes and memory exhaustion
-tags: connections, max-connections, limits, stability
----
-
-## Set Appropriate Connection Limits
-
-Too many connections exhaust memory and degrade performance. Set limits based on available resources.
-
-**Incorrect (unlimited or excessive connections):**
-
-```sql
--- Default max_connections = 100, but often increased blindly
-show max_connections;  -- 500 (way too high for 4GB RAM)
-
--- Each connection uses 1-3MB RAM
--- 500 connections * 2MB = 1GB just for connections!
--- Out of memory errors under load
-```
-
-**Correct (calculate based on resources):**
-
-```sql
--- Formula: max_connections = (RAM in MB / 5MB per connection) - reserved
--- For 4GB RAM: (4096 / 5) - 10 = ~800 theoretical max
--- But practically, 100-200 is better for query performance
-
--- Recommended settings for 4GB RAM
-alter system set max_connections = 100;
-
--- Also set work_mem appropriately
--- work_mem * max_connections should not exceed 25% of RAM
-alter system set work_mem = '8MB';  -- 8MB * 100 = 800MB max
-```
-
-Monitor connection usage:
-
-```sql
-select count(*), state from pg_stat_activity group by state;
-```
-
-Reference: [Database Connections](https://supabase.com/docs/guides/platform/performance#connection-management)