AGC 支持 Anthropic 独立网关路由与后台协议选项

新增平台 Anthropic 网关路由 /api/llm/anthropic/{*path}，复用账号 Router 凭据边界
OpenAI 侧规范路径改为 /api/llm/v1/responses 与 /api/llm/v1/chat/completions，旧路径保留兼容
baseUrl 不再携带路由与版本段，统一由协议自己拼 v1/<op>
cc 执行器改走平台网关，ANTHROPIC_AUTH_TOKEN 复用平台会话，不再直连 Router
后台模型目录 agentMode 增加 anthropic，管理页与客户端契约同步
补齐三条路由埋点与静态段白名单，新增三条回归测试
同步后端架构文档、模型别名文档与排障记忆

server-rs/crates/module-runtime/src/agc_models.rs

@@ -17,6 +17,9 @@ pub const AGC_MODEL_CATALOG_MAX_MODELS: usize = 32;
 pub enum AgcAgentMode {
     Codex,
     Cc,
+    /// 显式 Anthropic Messages 协议。`cc` 是同一执行器的历史别名，
+    /// 新目录项应直接写 `anthropic`。
+    Anthropic,
 }
 
 impl Default for AgcAgentMode {
@@ -30,6 +33,7 @@ impl AgcAgentMode {
         match self {
             Self::Codex => "codex",
             Self::Cc => "cc",
+            Self::Anthropic => "anthropic",
         }
     }
 
@@ -37,7 +41,8 @@ impl AgcAgentMode {
         match value {
             "codex" => Ok(Self::Codex),
             "cc" => Ok(Self::Cc),
-            _ => Err("Agent 模式只允许 codex 或 cc".into()),
+            "anthropic" => Ok(Self::Anthropic),
+            _ => Err("Agent 模式只允许 codex、cc 或 anthropic".into()),
         }
     }
 }
@@ -340,13 +345,21 @@ mod tests {
     }
 
     #[test]
-    fn catalog_agent_mode_accepts_codex_and_cc_only() {
+    fn catalog_agent_mode_accepts_codex_cc_and_anthropic_only() {
         let mut catalog =
             AgcModelCatalog::from_upstream_models(upstream(&["model-a", "model-b"]), 0).unwrap();
         catalog.models[0].agent_mode = AgcAgentMode::Cc;
         assert!(catalog.validate().is_ok());
         assert_eq!(catalog.models[0].agent_mode.as_str(), "cc");
 
+        catalog.models[0].agent_mode = AgcAgentMode::Anthropic;
+        assert!(catalog.validate().is_ok());
+        assert_eq!(catalog.models[0].agent_mode.as_str(), "anthropic");
+        assert_eq!(
+            AgcAgentMode::parse("anthropic").unwrap(),
+            AgcAgentMode::Anthropic
+        );
+
         let invalid: Result<AgcModelCatalog, _> = serde_json::from_str(
             r#"{"revision":0,"defaultModelId":"model-a","models":[{"id":"model-a","alias":"model-a","modelId":"model-a","enabled":true,"agentMode":"provider"}]}"#,
         );