feat(api): 接入微信登录并原生实现咨询域（ECR-049/050）

小程序可在 Go 上完成微信手机号登录、测评、预约和下单，不再反代 Java。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/internal/config/config.go

@@ -19,6 +19,29 @@ type Config struct {
 	AppEnv      string
 	DeepSeek    DeepSeekConfig
 	Admin       AdminConfig
+	WeChat      WeChatConfig
+	Java        JavaConfig
+	Pay         PayConfig
+}
+
+// PayConfig is WeChat JSAPI merchant settings.
+type PayConfig struct {
+	AppID     string
+	MchID     string
+	APIKey    string
+	NotifyURL string
+}
+
+// WeChatConfig is mini-program jscode2session credentials.
+type WeChatConfig struct {
+	AppID  string
+	Secret string
+}
+
+// JavaConfig is the consult stack bridge (internal issue + proxy).
+type JavaConfig struct {
+	BaseURL     string
+	InternalKey string
 }
 
 // AdminConfig for ops console bootstrap (ECR-006).
@@ -58,6 +81,20 @@ type fileConfig struct {
 		BootstrapUsername string `yaml:"bootstrap_username"`
 		BootstrapPassword string `yaml:"bootstrap_password"`
 	} `yaml:"admin"`
+	WeChat struct {
+		AppID  string `yaml:"app_id"`
+		Secret string `yaml:"secret"`
+	} `yaml:"wechat"`
+	Java struct {
+		BaseURL     string `yaml:"base_url"`
+		InternalKey string `yaml:"internal_key"`
+	} `yaml:"java"`
+	Pay struct {
+		AppID     string `yaml:"app_id"`
+		MchID     string `yaml:"mch_id"`
+		APIKey    string `yaml:"api_key"`
+		NotifyURL string `yaml:"notify_url"`
+	} `yaml:"pay"`
 }
 
 // Load reads config.local.yaml (or CONFIG_PATH), then applies env overrides.
@@ -140,6 +177,30 @@ func mergeFile(cfg *Config, path string) error {
 	if f.Admin.BootstrapPassword != "" {
 		cfg.Admin.BootstrapPassword = f.Admin.BootstrapPassword
 	}
+	if f.WeChat.AppID != "" {
+		cfg.WeChat.AppID = f.WeChat.AppID
+	}
+	if f.WeChat.Secret != "" {
+		cfg.WeChat.Secret = f.WeChat.Secret
+	}
+	if f.Java.BaseURL != "" {
+		cfg.Java.BaseURL = strings.TrimRight(f.Java.BaseURL, "/")
+	}
+	if f.Java.InternalKey != "" {
+		cfg.Java.InternalKey = f.Java.InternalKey
+	}
+	if f.Pay.AppID != "" {
+		cfg.Pay.AppID = f.Pay.AppID
+	}
+	if f.Pay.MchID != "" {
+		cfg.Pay.MchID = f.Pay.MchID
+	}
+	if f.Pay.APIKey != "" {
+		cfg.Pay.APIKey = f.Pay.APIKey
+	}
+	if f.Pay.NotifyURL != "" {
+		cfg.Pay.NotifyURL = f.Pay.NotifyURL
+	}
 	return nil
 }
 
@@ -207,6 +268,30 @@ func applyEnv(cfg *Config) {
 	if v := os.Getenv("ADMIN_BOOTSTRAP_PASSWORD"); v != "" {
 		cfg.Admin.BootstrapPassword = v
 	}
+	if v := os.Getenv("WECHAT_MINI_APP_ID"); v != "" {
+		cfg.WeChat.AppID = v
+	}
+	if v := os.Getenv("WECHAT_MINI_APP_SECRET"); v != "" {
+		cfg.WeChat.Secret = v
+	}
+	if v := os.Getenv("JAVA_CONSULT_BASE_URL"); v != "" {
+		cfg.Java.BaseURL = strings.TrimRight(v, "/")
+	}
+	if v := os.Getenv("JAVA_INTERNAL_KEY"); v != "" {
+		cfg.Java.InternalKey = v
+	}
+	if v := os.Getenv("PAY_APP_ID"); v != "" {
+		cfg.Pay.AppID = v
+	}
+	if v := os.Getenv("PAY_MCH_ID"); v != "" {
+		cfg.Pay.MchID = v
+	}
+	if v := os.Getenv("PAY_API_KEY"); v != "" {
+		cfg.Pay.APIKey = v
+	}
+	if v := os.Getenv("PAY_NOTIFY_URL"); v != "" {
+		cfg.Pay.NotifyURL = v
+	}
 }
 
 // Enabled reports whether DeepSeek can be called.