fix: use relative /api URL to prevent mixed content errors on HTTPS

frontend/src/services/adminService.ts

@@ -1,6 +1,6 @@
 import axios from 'axios';
 
-const API_BASE = import.meta.env.VITE_API_BASE || 'http://localhost:8001/api';
+const API_BASE = import.meta.env.VITE_API_BASE || '/api';
 
 const api = axios.create({ baseURL: API_BASE, withCredentials: true });
 

frontend/src/services/authService.ts

@@ -1,7 +1,7 @@
 import axios from 'axios';
 import type { UserResponse } from '../store/useAuthStore';
 
-const API_BASE = import.meta.env.VITE_API_BASE || 'http://localhost:8001/api';
+const API_BASE = import.meta.env.VITE_API_BASE || '/api';
 
 const api = axios.create({ baseURL: API_BASE, withCredentials: true });
 

frontend/src/services/compilation.ts

@@ -1,6 +1,6 @@
 import axios from 'axios';
 
-const API_BASE = import.meta.env.VITE_API_BASE || 'http://localhost:8001/api';
+const API_BASE = import.meta.env.VITE_API_BASE || '/api';
 
 export interface SketchFile {
   name: string;

frontend/src/services/libraryService.ts

@@ -1,4 +1,4 @@
-const API_BASE = `${import.meta.env.VITE_API_BASE || 'http://localhost:8001/api'}/libraries`;
+const API_BASE = `${import.meta.env.VITE_API_BASE || '/api'}/libraries`;
 
 export interface ArduinoLibrary {
     name: string;

frontend/src/services/projectService.ts

@@ -1,6 +1,6 @@
 import axios from 'axios';
 
-const API_BASE = import.meta.env.VITE_API_BASE || 'http://localhost:8001/api';
+const API_BASE = import.meta.env.VITE_API_BASE || '/api';
 
 const api = axios.create({ baseURL: API_BASE, withCredentials: true });
 

frontend/vite.config.ts

@@ -12,6 +12,14 @@ export default defineConfig({
       '@wokwi/elements': path.resolve(__dirname, '../wokwi-libs/wokwi-elements/dist/esm'),
     },
   },
+  server: {
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8001',
+        changeOrigin: true,
+      },
+    },
+  },
   optimizeDeps: {
     include: ['avr8js', 'rp2040js', '@wokwi/elements'],
   },