Fix double /api/ prefix in API endpoint calls

When VITE_API_URL=/api, axios baseURL is already set to /api. However, all endpoint calls included the /api/ prefix, creating double paths like /api/api/auth/login/.

Removed /api/ prefix from 81 API endpoint calls across 22 files:
- src/api/auth.ts - Fixed login, logout, me, refresh, hijack endpoints
- src/api/client.ts - Fixed token refresh endpoint
- src/api/profile.ts - Fixed all profile, email, password, MFA, sessions endpoints
- src/hooks/*.ts - Fixed all remaining API calls (users, appointments, resources, etc)
- src/pages/*.tsx - Fixed signup and email verification endpoints

This ensures API requests use the correct path: /api/auth/login/ instead of /api/api/auth/login/

🤖 Generated with Claude Code

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

frontend/test-results/.last-run.json

@@ -1,8 +0,0 @@
-{
-  "status": "failed",
-  "failedTests": [
-    "590ad8d7fc7ae2069797-2afcd486fa868ee7fcc3",
-    "590ad8d7fc7ae2069797-90df2b140e1ff4bac88e",
-    "590ad8d7fc7ae2069797-def5944da7e0860b9fef"
-  ]
-}