feat: add ENABLE_CLAUDEAI_MCP_SERVERS opt-out setting

Adds a toggle in the MCP Servers settings section to control whether
Claude Code connects to MCP servers configured in Claude.ai. When
disabled, sets ENABLE_CLAUDEAI_MCP_SERVERS=false. Also fixes a
pre-existing omission of disable_cron from the TypeScript HikariConfig
interface.

Closes #210

src-tauri/src/wsl_bridge.rs

@@ -320,6 +320,11 @@ impl WslBridge {
                 cmd.env("CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS", "1");
             }
 
+            // Opt out of claude.ai MCP servers if requested
+            if !options.enable_claudeai_mcp_servers {
+                cmd.env("ENABLE_CLAUDEAI_MCP_SERVERS", "false");
+            }
+
             cmd
         } else {
             // Running on Windows - use wsl with bash login shell to ensure PATH is loaded
@@ -382,6 +387,11 @@ impl WslBridge {
                 claude_cmd.push_str("CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS=1 ");
             }
 
+            // Opt out of claude.ai MCP servers if requested
+            if !options.enable_claudeai_mcp_servers {
+                claude_cmd.push_str("ENABLE_CLAUDEAI_MCP_SERVERS=false ");
+            }
+
             claude_cmd.push_str(
                 "claude --output-format stream-json --input-format stream-json --verbose",
             );