add Pinia axios and VITE config to frontend.

frontend/src/config/index.ts

@@ -0,0 +1,29 @@
+const env = (key: string): string => {
+    const value = import.meta.env[key];
+    if (value === undefined || value === null) {
+        return '';
+    }
+    return String(value);
+};
+
+const envInt = (key: string, fallback: number): number => {
+    const raw = env(key);
+    if (!raw) {
+        return fallback;
+    }
+    const parsed = parseInt(raw, 10);
+    return Number.isFinite(parsed) ? parsed : fallback;
+};
+
+export const config = {
+    api: {
+        baseUrl: env('VITE_API_BASE_URL')
+    },
+    share: {
+        clearnetDomain: env('VITE_CLEARNET_DOMAIN'),
+        onionHostname: env('VITE_ONION_HOSTNAME')
+    },
+    limits: {
+        maxImagesPerUpload: envInt('VITE_MAX_IMAGES_PER_UPLOAD', 10)
+    }
+};