feat(lyra): 接入 PostgreSQL 与 Goose 迁移

- 使用 pgx/sqlx 建立连接，从环境变量读取数据库密码
- 添加本地 PostgreSQL Compose 配置与初始迁移
- 补充 Goose 操作手册和连接串排错说明

go/projects/lyra/go.mod

@@ -4,6 +4,8 @@ go 1.27.1
 
 require (
 	github.com/gin-gonic/gin v1.12.0
+	github.com/jackc/pgx/v5 v5.11.0
+	github.com/jmoiron/sqlx v1.4.0
 	github.com/spf13/viper v1.21.0
 )
 
@@ -21,6 +23,10 @@ require (
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/goccy/go-yaml v1.19.2 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
@@ -43,6 +49,7 @@ require (
 	golang.org/x/arch v0.22.0 // indirect
 	golang.org/x/crypto v0.48.0 // indirect
 	golang.org/x/net v0.51.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
 	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/text v0.34.0 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect