补充遗漏翻译，新增启动脚本，整理import

app/routes/main_routes.py

@@ -1,5 +1,4 @@
 import json
-import trimesh
 import uuid
 import os
 import configparser
@@ -8,15 +7,13 @@ from flask import Blueprint, render_template, request, redirect, url_for, flash,
 from flask_login import login_user, logout_user, login_required, current_user
 from werkzeug.security import generate_password_hash, check_password_hash
 from werkzeug.utils import secure_filename
-from app.models import db, User, PrintFile, SystemConfig
+from app.models import db, User, PrintFile, SystemConfig, UserSession
 from app.utils.tasks import merge_and_slice_task, slice_stl_task, simplify_stl_task
 from app import i18n_dict
-# import trimesh.repair
 from app.utils.stl_simplifier import simplify_stl
 from app.routes.admin_routes import get_gcode_dir
 from app.utils.slice_engines import get_slicer_engine
-from app.models import UserSession
-from flask_login import logout_user
+from app.utils.gcode_parser import get_gcode_metadata
 
 main_bp = Blueprint('main', __name__)
 
@@ -90,6 +87,8 @@ def check_quota(user, file_type, size_bytes):
 # Guest User Middleware
 @main_bp.before_app_request
 def assign_guest_cookie():
+    if request.path.startswith('/api/'):
+        return
     if not current_user.is_authenticated:
         guest_id = request.cookies.get('guest_id')
         if not guest_id:
@@ -304,7 +303,6 @@ def preview_gcode(file_id):
     filament_used = "-"
     
     if os.path.exists(filepath):
-        from app.utils.gcode_parser import get_gcode_metadata
         metadata = get_gcode_metadata(filepath)
         time_info = metadata.get('print_time', '-')
         layer1_time = metadata.get('first_layer_time', '-')
@@ -595,8 +593,6 @@ def account():
         flash('Guests cannot manage accounts.', 'danger')
         return redirect(url_for('main.index'))
     
-    from app.models import UserSession
-    
     if request.method == 'POST':
         action = request.form.get('action')