docs(ko-KR): add Korean translation for skills

- 15 skill categories (17 files): coding-standards, tdd-workflow,
  frontend-patterns, backend-patterns, security-review (2 files),
  postgres-patterns, verification-loop, continuous-learning,
  continuous-learning-v2, eval-harness, iterative-retrieval,
  strategic-compact, golang-patterns, golang-testing, clickhouse-io,
  project-guidelines-example

docs/ko-KR/skills/postgres-patterns/SKILL.md

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+---
+name: postgres-patterns
+description: 쿼리 최적화, 스키마 설계, 인덱싱, 보안을 위한 PostgreSQL 데이터베이스 패턴. Supabase 모범 사례 기반.
+origin: ECC
+---
+
+# PostgreSQL 패턴
+
+PostgreSQL 모범 사례 빠른 참조. 자세한 가이드는 `database-reviewer` 에이전트를 사용하세요.
+
+## 활성화 시점
+
+- SQL 쿼리 또는 마이그레이션을 작성할 때
+- 데이터베이스 스키마를 설계할 때
+- 느린 쿼리를 문제 해결할 때
+- Row Level Security를 구현할 때
+- 커넥션 풀링을 설정할 때
+
+## 빠른 참조
+
+### 인덱스 치트 시트
+
+| 쿼리 패턴 | 인덱스 유형 | 예시 |
+|--------------|------------|---------|
+| `WHERE col = value` | B-tree (기본값) | `CREATE INDEX idx ON t (col)` |
+| `WHERE col > value` | B-tree | `CREATE INDEX idx ON t (col)` |
+| `WHERE a = x AND b > y` | Composite | `CREATE INDEX idx ON t (a, b)` |
+| `WHERE jsonb @> '{}'` | GIN | `CREATE INDEX idx ON t USING gin (col)` |
+| `WHERE tsv @@ query` | GIN | `CREATE INDEX idx ON t USING gin (col)` |
+| 시계열 범위 | BRIN | `CREATE INDEX idx ON t USING brin (col)` |
+
+### 데이터 타입 빠른 참조
+
+| 사용 사례 | 올바른 타입 | 지양 |
+|----------|-------------|-------|
+| ID | `bigint` | `int`, random UUID |
+| 문자열 | `text` | `varchar(255)` |
+| 타임스탬프 | `timestamptz` | `timestamp` |
+| 금액 | `numeric(10,2)` | `float` |
+| 플래그 | `boolean` | `varchar`, `int` |
+
+### 일반 패턴
+
+**복합 인덱스 순서:**
+```sql
+-- Equality columns first, then range columns
+CREATE INDEX idx ON orders (status, created_at);
+-- Works for: WHERE status = 'pending' AND created_at > '2024-01-01'
+```
+
+**커버링 인덱스:**
+```sql
+CREATE INDEX idx ON users (email) INCLUDE (name, created_at);
+-- Avoids table lookup for SELECT email, name, created_at
+```
+
+**부분 인덱스:**
+```sql
+CREATE INDEX idx ON users (email) WHERE deleted_at IS NULL;
+-- Smaller index, only includes active users
+```
+
+**RLS 정책 (최적화):**
+```sql
+CREATE POLICY policy ON orders
+  USING ((SELECT auth.uid()) = user_id);  -- Wrap in SELECT!
+```
+
+**UPSERT:**
+```sql
+INSERT INTO settings (user_id, key, value)
+VALUES (123, 'theme', 'dark')
+ON CONFLICT (user_id, key)
+DO UPDATE SET value = EXCLUDED.value;
+```
+
+**커서 페이지네이션:**
+```sql
+SELECT * FROM products WHERE id > $last_id ORDER BY id LIMIT 20;
+-- O(1) vs OFFSET which is O(n)
+```
+
+**큐 처리:**
+```sql
+UPDATE jobs SET status = 'processing'
+WHERE id = (
+  SELECT id FROM jobs WHERE status = 'pending'
+  ORDER BY created_at LIMIT 1
+  FOR UPDATE SKIP LOCKED
+) RETURNING *;
+```
+
+### 안티패턴 감지
+
+```sql
+-- Find unindexed foreign keys
+SELECT conrelid::regclass, a.attname
+FROM pg_constraint c
+JOIN pg_attribute a ON a.attrelid = c.conrelid AND a.attnum = ANY(c.conkey)
+WHERE c.contype = 'f'
+  AND NOT EXISTS (
+    SELECT 1 FROM pg_index i
+    WHERE i.indrelid = c.conrelid AND a.attnum = ANY(i.indkey)
+  );
+
+-- Find slow queries
+SELECT query, mean_exec_time, calls
+FROM pg_stat_statements
+WHERE mean_exec_time > 100
+ORDER BY mean_exec_time DESC;
+
+-- Check table bloat
+SELECT relname, n_dead_tup, last_vacuum
+FROM pg_stat_user_tables
+WHERE n_dead_tup > 1000
+ORDER BY n_dead_tup DESC;
+```
+
+### 구성 템플릿
+
+```sql
+-- Connection limits (adjust for RAM)
+ALTER SYSTEM SET max_connections = 100;
+ALTER SYSTEM SET work_mem = '8MB';
+
+-- Timeouts
+ALTER SYSTEM SET idle_in_transaction_session_timeout = '30s';
+ALTER SYSTEM SET statement_timeout = '30s';
+
+-- Monitoring
+CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
+
+-- Security defaults
+REVOKE ALL ON SCHEMA public FROM public;
+
+SELECT pg_reload_conf();
+```
+
+## 관련 항목
+
+- 에이전트: `database-reviewer` - 전체 데이터베이스 리뷰 워크플로우
+- 스킬: `clickhouse-io` - ClickHouse 분석 패턴
+- 스킬: `backend-patterns` - API 및 백엔드 패턴
+
+---
+
+*Supabase Agent Skills 기반 (크레딧: Supabase 팀) (MIT License)*