feat: add MCP endpoint exposing calendar tools over Streamable HTTP

Adds a POST /mcp endpoint (github.com/modelcontextprotocol/go-sdk) with
three tools mirroring the existing /calendar logic: get_calendar_today,
get_calendar_for_date and get_holidays. Bumps go.mod to Go 1.25 (required
by the SDK) and vendors the new dependencies. Also fixes an unanchored
.gitignore rule ("domogeek") that was silently excluding all untracked
files under cmd/domogeek/.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Hu8wwahgecuCGfesTKCfEd

vendor/golang.org/x/sys/windows/service.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 package windows
 
@@ -141,6 +140,12 @@ const (
 	SERVICE_DYNAMIC_INFORMATION_LEVEL_START_REASON = 1
 )
 
+type ENUM_SERVICE_STATUS struct {
+	ServiceName   *uint16
+	DisplayName   *uint16
+	ServiceStatus SERVICE_STATUS
+}
+
 type SERVICE_STATUS struct {
 	ServiceType             uint32
 	CurrentState            uint32
@@ -212,6 +217,10 @@ type SERVICE_FAILURE_ACTIONS struct {
 	Actions      *SC_ACTION
 }
 
+type SERVICE_FAILURE_ACTIONS_FLAG struct {
+	FailureActionsOnNonCrashFailures int32
+}
+
 type SC_ACTION struct {
 	Type  uint32
 	Delay uint32
@@ -245,3 +254,4 @@ type QUERY_SERVICE_LOCK_STATUS struct {
 //sys	UnsubscribeServiceChangeNotifications(subscription uintptr) = sechost.UnsubscribeServiceChangeNotifications?
 //sys	RegisterServiceCtrlHandlerEx(serviceName *uint16, handlerProc uintptr, context uintptr) (handle Handle, err error) = advapi32.RegisterServiceCtrlHandlerExW
 //sys	QueryServiceDynamicInformation(service Handle, infoLevel uint32, dynamicInfo unsafe.Pointer) (err error) = advapi32.QueryServiceDynamicInformation?
+//sys	EnumDependentServices(service Handle, activityState uint32, services *ENUM_SERVICE_STATUS, buffSize uint32, bytesNeeded *uint32, servicesReturned *uint32) (err error) = advapi32.EnumDependentServicesW