feat: Phase 6 — require_active_service decorator + wizard install wiring

Email/calendar/files routes now return 404 when the service is not
installed, using a require_active_service decorator that checks
ServiceRegistry. Status endpoints are exempt so health checks always work.

SetupManager.complete_setup() now accepts a service_store_manager and
installs any wizard-selected services in a background daemon thread after
setup completes. Failures are logged but do not fail the wizard.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/routes/files.py

@@ -1,9 +1,12 @@
 import logging
 from flask import Blueprint, request, jsonify
+from routes import require_active_service
+
 logger = logging.getLogger('picell')
 bp = Blueprint('files', __name__)
 
 @bp.route('/api/files/users', methods=['GET'])
+@require_active_service('files')
 def get_file_users():
     """Get file storage users."""
     try:
@@ -15,6 +18,7 @@ def get_file_users():
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/users', methods=['POST'])
+@require_active_service('files')
 def create_file_user():
     """Create file storage user."""
     try:
@@ -33,6 +37,7 @@ def create_file_user():
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/users/<username>', methods=['DELETE'])
+@require_active_service('files')
 def delete_file_user(username):
     """Delete file storage user."""
     try:
@@ -44,6 +49,7 @@ def delete_file_user(username):
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/folders', methods=['POST'])
+@require_active_service('files')
 def create_folder():
     """Create folder."""
     try:
@@ -64,6 +70,7 @@ def create_folder():
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/folders/<username>/<path:folder_path>', methods=['DELETE'])
+@require_active_service('files')
 def delete_folder(username, folder_path):
     """Delete folder."""
     try:
@@ -77,6 +84,7 @@ def delete_folder(username, folder_path):
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/upload/<username>', methods=['POST'])
+@require_active_service('files')
 def upload_file(username):
     """Upload file."""
     try:
@@ -97,6 +105,7 @@ def upload_file(username):
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/download/<username>/<path:file_path>', methods=['GET'])
+@require_active_service('files')
 def download_file(username, file_path):
     """Download file."""
     try:
@@ -110,6 +119,7 @@ def download_file(username, file_path):
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/delete/<username>/<path:file_path>', methods=['DELETE'])
+@require_active_service('files')
 def delete_file(username, file_path):
     """Delete file."""
     try:
@@ -123,6 +133,7 @@ def delete_file(username, file_path):
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/list/<username>', methods=['GET'])
+@require_active_service('files')
 def list_files(username):
     """List files."""
     try:
@@ -148,6 +159,7 @@ def get_file_status():
         return jsonify({"error": str(e)}), 500
 
 @bp.route('/api/files/connectivity', methods=['GET'])
+@require_active_service('files')
 def test_file_connectivity():
     """Test file service connectivity."""
     try: