Implement container logs handler

- Add Docker client to handlers for container operations
- Implement HandleAppLogs() to fetch and return container logs
- Support ?tail=N query parameter (default 500 lines)
- Handle missing container gracefully

internal/handlers/handlers_test.go

@@ -86,7 +86,7 @@ func createAppServices(
 	logInstance *logger.Logger,
 	dbInstance *database.Database,
 	cfg *config.Config,
-) (*auth.Service, *app.Service, *deploy.Service, *webhook.Service) {
+) (*auth.Service, *app.Service, *deploy.Service, *webhook.Service, *docker.Client) {
 	t.Helper()
 
 	authSvc, authErr := auth.New(fx.Lifecycle(nil), auth.ServiceParams{
@@ -128,7 +128,7 @@ func createAppServices(
 	})
 	require.NoError(t, webhookErr)
 
-	return authSvc, appSvc, deploySvc, webhookSvc
+	return authSvc, appSvc, deploySvc, webhookSvc, dockerClient
 }
 
 func setupTestHandlers(t *testing.T) *testContext {
@@ -138,7 +138,7 @@ func setupTestHandlers(t *testing.T) *testContext {
 
 	globalInstance, logInstance, dbInstance, hcInstance := createCoreServices(t, cfg)
 
-	authSvc, appSvc, deploySvc, webhookSvc := createAppServices(
+	authSvc, appSvc, deploySvc, webhookSvc, dockerClient := createAppServices(
 		t,
 		logInstance,
 		dbInstance,
@@ -156,6 +156,7 @@ func setupTestHandlers(t *testing.T) *testContext {
 			App:         appSvc,
 			Deploy:      deploySvc,
 			Webhook:     webhookSvc,
+			Docker:      dockerClient,
 		},
 	)
 	require.NoError(t, handlerErr)