feat(web): public read-only file browser — GET API public, writes require admin

- /api/v1/* GET (list buckets/objects, download) no longer requires auth
- POST/DELETE/PUT stay behind requireAuth (upload, create/delete bucket, copy, delete object)
- FE drops blocking login screen: visitors browse + download freely
- Admin-only UI (create bucket, upload dropzone, delete, S3 creds) hidden in read-only mode
- Login button in topbar to unlock admin actions

test/public-readonly-routes.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'bun:test';
+
+const defaultEnv = (key: string, value: string) => {
+  process.env[key] ||= value;
+};
+const setEnv = (key: string, value: string) => {
+  process.env[key] = value;
+};
+
+defaultEnv('BOT_TOKENS', '123456:ABC-DEF');
+defaultEnv('STORAGE_CHANNEL_ID', '-1001234567890');
+defaultEnv('BASE_URL', 'https://example.com');
+defaultEnv('DATABASE_URL', 'postgresql://user:***@localhost:5432/test');
+defaultEnv('PORT', '3000');
+defaultEnv('NODE_ENV', 'test');
+setEnv('ADMIN_API_TOKEN', 'route-secret-token');
+setEnv('SESSION_COOKIE_NAME', 'route_session');
+setEnv('SESSION_COOKIE_MAX_AGE_SECONDS', '3600');
+
+const { routes } = await import('../src/interfaces/http/routes/index');
+const { handleWebApiV1 } = await import('../src/interfaces/http/controllers/web-api-controller');
+
+describe('public read-only API routing', () => {
+  it('serves GET /api/v1/* without auth (read endpoints are public)', () => {
+    // The GET handler must be the raw web API handler — NOT requireAuth-wrapped.
+    expect(routes['/api/v1/*'].GET).toBe(handleWebApiV1);
+  });
+
+  it('protects write endpoints with auth (POST/DELETE/PUT)', () => {
+    // requireAuth wraps the handler into a new function, so these must NOT be
+    // the raw handler — they are auth-guarded.
+    expect(routes['/api/v1/*'].POST).not.toBe(handleWebApiV1);
+    expect(routes['/api/v1/*'].DELETE).not.toBe(handleWebApiV1);
+    expect(routes['/api/v1/*'].PUT).not.toBe(handleWebApiV1);
+  });
+
+  it('keeps the auth/me endpoint accessible (frontend uses it to detect admin state)', () => {
+    expect(routes['/api/v1/auth/me']).toBeDefined();
+    expect(typeof routes['/api/v1/auth/me'].GET).toBe('function');
+  });
+});