feat: add support for HTTP/2 Cleartext (h2c) connections

deploy/.env.example

@@ -20,6 +20,10 @@ SERVER_PORT=8080
 # Server mode: release or debug
 SERVER_MODE=release
 
+# Enable HTTP/2 Cleartext (h2c) for client connections
+# 启用 HTTP/2 Cleartext (h2c) 客户端连接
+SERVER_ENABLE_H2C=true
+
 # 运行模式: standard (默认) 或 simple (内部自用)
 # standard: 完整 SaaS 功能，包含计费/余额校验；simple: 隐藏 SaaS 功能并跳过计费/余额校验
 RUN_MODE=standard

deploy/config.example.yaml

@@ -23,6 +23,9 @@ server:
   # Trusted proxies for X-Forwarded-For parsing (CIDR/IP). Empty disables trusted proxies.
   # 信任的代理地址（CIDR/IP 格式），用于解析 X-Forwarded-For 头。留空则禁用代理信任。
   trusted_proxies: []
+  # Enable HTTP/2 Cleartext (h2c) for client connections
+  # 启用 HTTP/2 Cleartext (h2c) 客户端连接
+  enable_h2c: true
 
 # =============================================================================
 # Run Mode Configuration