PostgreSQL 의존성 및 내부 유틸리티 추가:

- `github.com/lib/pq` PostgreSQL 드라이버 vendor 디렉토리에 추가.
- PostgreSQL 관련 내부 패키지(`pqsql`, `proto`, `pqtime`, `pgpass`, `pgservice`, `pqutil`) 구현:
  - SQL 어휘 처리, 프로토콜 상수 및 구조 정의, 시간 파서/포맷터(`Parse`, `Format`).
  - `.pgpass` 파일 및 `pg_service.conf` 관리 기능 추가.
  - 파일/사용자 권한 검증 및 플랫폼별 사용자 정보 조회 기능 포함.
- 데이터베이스 초기화 로직 추가 (`services/db.go`):
  - PostgreSQL 연결 설정 및 초기 스키마 생성.
- 자동매매 관련 DB 레포지토리(`services/autotrade_repo.go`) 구현:
  - 자동매매 규칙 및 포지션 관리 로직 추가 (`dbInsertRule`, `dbLoadRules` 등).

vendor/github.com/lib/pq/compose.yaml

@@ -0,0 +1,89 @@
+name: 'pqgo'
+
+services:
+  pgbouncer:
+    profiles: ['pgbouncer']
+    image:    'cleanstart/pgbouncer:latest'
+    ports:    ['127.0.0.1:6432:6432']
+    command:  ['/init/pgbouncer.ini']
+    volumes:  ['./testdata/pgbouncer:/init', './testdata/ssl:/ssl']
+    environment:
+      'PGBOUNCER_DATABASE': 'pqgo'
+
+  pgpool:
+    profiles:   ['pgpool']
+    image:      'pgpool/pgpool:4.4.3'
+    ports:      ['127.0.0.1:7432:7432']
+    volumes:    ['./testdata/pgpool:/init', './testdata/ssl:/ssl']
+    entrypoint: '/init/entry.sh'
+    environment:
+      'PGPOOL_PARAMS_PORT':              '7432'
+      'PGPOOL_PARAMS_BACKEND_HOSTNAME0': 'pg18'
+
+  cockroach:
+    profiles:    ['cockroach']
+    image:       'cockroachdb/cockroach:latest-v26.1'
+    ports:       ['127.0.0.1:26257:26257']
+    volumes:     ['./testdata/cockroach:/docker-entrypoint-initdb.d', './testdata/ssl:/ssl']
+    command:     ['start-single-node', '--accept-sql-without-tls', '--certs-dir=/ssl2']
+    healthcheck: {test: ['CMD-SHELL', '/cockroach/cockroach node status --insecure --user=pqgo'], start_period: '30s', start_interval: '1s'}
+
+  pg18:
+    image:       'postgres:18'
+    ports:       ['127.0.0.1:5432:5432']
+    entrypoint:  '/init/entry.sh'
+    volumes:     ['./testdata/postgres:/init', './testdata/ssl:/ssl']
+    shm_size:    '128mb'
+    healthcheck: {test: ['CMD-SHELL', 'pg_isready -U pqgo -d pqgo'], start_period: '30s', start_interval: '1s'}
+    environment:
+      'POSTGRES_DATABASE': 'pqgo'
+      'POSTGRES_USER':     'pqgo'
+      'POSTGRES_PASSWORD': 'unused'
+  pg17:
+    profiles:    ['pg17']
+    image:       'postgres:17'
+    ports:       ['127.0.0.1:5432:5432']
+    entrypoint:  '/init/entry.sh'
+    volumes:     ['./testdata/postgres:/init', './testdata/ssl:/ssl']
+    shm_size:    '128mb'
+    healthcheck: {test: ['CMD-SHELL', 'pg_isready -U pqgo -d pqgo'], start_period: '30s', start_interval: '1s'}
+    environment:
+      'POSTGRES_DATABASE': 'pqgo'
+      'POSTGRES_USER':     'pqgo'
+      'POSTGRES_PASSWORD': 'unused'
+  pg16:
+    profiles:    ['pg16']
+    image:       'postgres:16'
+    ports:       ['127.0.0.1:5432:5432']
+    entrypoint:  '/init/entry.sh'
+    volumes:     ['./testdata/postgres:/init', './testdata/ssl:/ssl']
+    shm_size:    '128mb'
+    healthcheck: {test: ['CMD-SHELL', 'pg_isready -U pqgo -d pqgo'], start_period: '30s', start_interval: '1s'}
+    environment:
+      'POSTGRES_DATABASE': 'pqgo'
+      'POSTGRES_USER':     'pqgo'
+      'POSTGRES_PASSWORD': 'unused'
+  pg15:
+    profiles:    ['pg15']
+    image:       'postgres:15'
+    ports:       ['127.0.0.1:5432:5432']
+    entrypoint:  '/init/entry.sh'
+    volumes:     ['./testdata/postgres:/init', './testdata/ssl:/ssl']
+    shm_size:    '128mb'
+    healthcheck: {test: ['CMD-SHELL', 'pg_isready -U pqgo -d pqgo'], start_period: '30s', start_interval: '1s'}
+    environment:
+      'POSTGRES_DATABASE': 'pqgo'
+      'POSTGRES_USER':     'pqgo'
+      'POSTGRES_PASSWORD': 'unused'
+  pg14:
+    profiles:    ['pg14']
+    image:       'postgres:14'
+    ports:       ['127.0.0.1:5432:5432']
+    entrypoint:  '/init/entry.sh'
+    volumes:     ['./testdata/postgres:/init', './testdata/ssl:/ssl']
+    shm_size:    '128mb'
+    healthcheck: {test: ['CMD-SHELL', 'pg_isready -U pqgo -d pqgo'], start_period: '30s', start_interval: '1s'}
+    environment:
+      'POSTGRES_DATABASE': 'pqgo'
+      'POSTGRES_USER':     'pqgo'
+      'POSTGRES_PASSWORD': 'unused'