fix(mcp_manager): change GitHub MCP default to docker mode

Remote mode requires GitHub Copilot subscription for OAuth authentication.
Change default to docker mode which works with PAT without subscription.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: trend-denny-lee

.env.example

@@ -6,10 +6,10 @@ GITHUB_PERSONAL_ACCESS_TOKEN=
 # For GitHub Enterprise Server, use your domain (e.g., github.mycompany.com)
 GITHUB_HOST=github.com
 
-# GitHub MCP Mode (Optional, defaults to "remote")
-# - remote: Use GitHub-hosted MCP server (Recommended, no Docker required)
-# - docker: Use local Docker container
-GITHUB_MCP_MODE=remote
+# GitHub MCP Mode (Optional, defaults to "docker")
+# - docker: Use local Docker container (Default, works without Copilot subscription)
+# - remote: Use GitHub-hosted MCP server (Requires GitHub Copilot subscription)
+GITHUB_MCP_MODE=docker
 
 # GitHub Toolsets (Optional, only used in docker mode)
 # Available: repos, issues, pull_requests, actions, code_security, discussions

src/features/mcp_manager/config.rs

@@ -26,10 +26,11 @@ impl EnvConfig {
     }
 
     /// 取得 GitHub MCP 模式（remote 或 docker）
+    /// 預設為 docker，因為 remote 模式需要 GitHub Copilot 訂閱
     pub fn github_mcp_mode_value(&self) -> &'static str {
         match self.github_mcp_mode {
-            Some(mode) if mode.eq_ignore_ascii_case("docker") => "docker",
-            _ => "remote",
+            Some(mode) if mode.eq_ignore_ascii_case("remote") => "remote",
+            _ => "docker",
         }
     }