feat: 添加YMT密钥解密密钥配置项

在配置文件中新增ymt_key_decrypt_key_b64字段，用于设置YMT密钥解密密钥
当配置项不为空时，自动将其设置为环境变量YMT_KEY_DECRYPT_KEY_B64

server/cmd/server/main.go

@@ -9,6 +9,7 @@ import (
     "marketing-system-data-tool/server/internal/logging"
     "net/http"
     "time"
+    "os"
 )
 
 func main() {
@@ -51,3 +52,4 @@ func main() {
 }
 
 // buildDSN deprecated; use cfg.YMTDB.DSN()/cfg.MarketingDB.DSN()
+    if cfg.YMTKeyDecryptKeyB64 != "" { os.Setenv("YMT_KEY_DECRYPT_KEY_B64", cfg.YMTKeyDecryptKeyB64) }

server/config_example.yaml

@@ -12,3 +12,4 @@ app:
     user: "YOUR_YMT_DB_USER"
     password: "YOUR_YMT_DB_PASSWORD"
     name: "YOUR_YMT_DB_NAME"
+  ymt_key_decrypt_key_b64: ""

server/internal/config/config.go

@@ -21,6 +21,7 @@ type App struct {
 	Port                string `yaml:"port"`
 	MarketingDB         DB     `yaml:"marketing_db"`
 	YMTDB               DB     `yaml:"ymt_db"`
+	YMTKeyDecryptKeyB64 string `yaml:"ymt_key_decrypt_key_b64"`
 }
 
 type root struct {