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/deprecated.go

@@ -0,0 +1,133 @@
+package pq
+
+import (
+	"bytes"
+	"database/sql"
+
+	"github.com/lib/pq/pqerror"
+)
+
+// [pq.Error.Severity] values.
+//
+// Deprecated: use pqerror.Severity[..] values.
+//
+//go:fix inline
+const (
+	Efatal   = pqerror.SeverityFatal
+	Epanic   = pqerror.SeverityPanic
+	Ewarning = pqerror.SeverityWarning
+	Enotice  = pqerror.SeverityNotice
+	Edebug   = pqerror.SeverityDebug
+	Einfo    = pqerror.SeverityInfo
+	Elog     = pqerror.SeverityLog
+)
+
+// PGError is an interface used by previous versions of pq.
+//
+// Deprecated: use the Error type. This is never used.
+type PGError interface {
+	Error() string
+	Fatal() bool
+	Get(k byte) (v string)
+}
+
+// Get implements the legacy PGError interface.
+//
+// Deprecated: new code should use the fields of the Error struct directly.
+func (e *Error) Get(k byte) (v string) {
+	switch k {
+	case 'S':
+		return e.Severity
+	case 'C':
+		return string(e.Code)
+	case 'M':
+		return e.Message
+	case 'D':
+		return e.Detail
+	case 'H':
+		return e.Hint
+	case 'P':
+		return e.Position
+	case 'p':
+		return e.InternalPosition
+	case 'q':
+		return e.InternalQuery
+	case 'W':
+		return e.Where
+	case 's':
+		return e.Schema
+	case 't':
+		return e.Table
+	case 'c':
+		return e.Column
+	case 'd':
+		return e.DataTypeName
+	case 'n':
+		return e.Constraint
+	case 'F':
+		return e.File
+	case 'L':
+		return e.Line
+	case 'R':
+		return e.Routine
+	}
+	return ""
+}
+
+// ParseURL converts a url to a connection string for driver.Open.
+//
+// Deprecated: directly passing an URL to sql.Open("postgres", "postgres://...")
+// now works, and calling this manually is no longer required.
+func ParseURL(url string) (string, error) { return convertURL(url) }
+
+// NullTime represents a [time.Time] that may be null.
+//
+// Deprecated: this is an alias for [sql.NullTime].
+//
+//go:fix inline
+type NullTime = sql.NullTime
+
+// CopyIn creates a COPY FROM statement which can be prepared with Tx.Prepare().
+// The target table should be visible in search_path.
+//
+// It copies all columns if the list of columns is empty.
+//
+// Deprecated: there is no need to use this query builder, you can use:
+//
+//	tx.Prepare("copy tbl (col1, col2) from stdin")
+func CopyIn(table string, columns ...string) string {
+	b := bytes.NewBufferString("COPY ")
+	BufferQuoteIdentifier(table, b)
+	makeStmt(b, columns...)
+	return b.String()
+}
+
+// CopyInSchema creates a COPY FROM statement which can be prepared with
+// Tx.Prepare().
+//
+// Deprecated: there is no need to use this query builder, you can use:
+//
+//	tx.Prepare("copy schema.tbl (col1, col2) from stdin")
+func CopyInSchema(schema, table string, columns ...string) string {
+	b := bytes.NewBufferString("COPY ")
+	BufferQuoteIdentifier(schema, b)
+	b.WriteRune('.')
+	BufferQuoteIdentifier(table, b)
+	makeStmt(b, columns...)
+	return b.String()
+}
+
+func makeStmt(b *bytes.Buffer, columns ...string) {
+	if len(columns) == 0 {
+		b.WriteString(" FROM STDIN")
+		return
+	}
+	b.WriteString(" (")
+	for i, col := range columns {
+		if i != 0 {
+			b.WriteString(", ")
+		}
+		BufferQuoteIdentifier(col, b)
+	}
+	b.WriteString(") FROM STDIN")
+}