fix(tests): Fix test suite failures and reduce to MLX-only providers

- Fix auth.routes.test.js: correct mock paths, add User model mock, update API expectations
- Fix image.routes.test.js: update tests for Phase 02 stub behavior (501 responses)
- Fix smartcampus.js: move requestId destructuring before try block (scoping fix)
- Move mock servers to tests/ directory (mock_mlx_server.js, mock_rag_server.js)
- Remove mock data: archivai-mock/, mock-chats.json
- Update PlannerSidebar: reduce model providers to MLX-only (text, vision, embed, whisper, tts, diffusion)
- Remove all cloud LLM providers (OpenAI, Claude, Gemini, Ollama, etc.)

Test results: 99/99 passing (100%)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: KBLLR

server/providers/smartcampus.js

@@ -14,7 +14,7 @@ function withMeta(requestId, meta = {}) {
 }
 
 /**
- * Smart Campus Provider (Tier 3C)
+ * Smart Campus Provider
  *
  * Connects to Smart Campus service for room and entity context.
  * Provides spatial and IoT context for campus-aware AI prompts.
@@ -86,11 +86,11 @@ export class SmartCampusProvider {
    */
   async queryRoom(roomId, options = {}) {
     const started = performance.now();
+    const { requestId } = options;
     try {
       const {
         includeEntities = true,
-        includeSensors = false,
-        requestId
+        includeSensors = false
       } = options;
 
       if (!roomId || typeof roomId !== 'string') {
@@ -180,9 +180,8 @@ export class SmartCampusProvider {
    */
   async queryEntity(entityId, options = {}) {
     const started = performance.now();
+    const { requestId } = options;
     try {
-      const { requestId } = options;
-
       if (!entityId || typeof entityId !== 'string') {
         throw new Error('Entity ID is required and must be a string');
       }
@@ -259,9 +258,8 @@ export class SmartCampusProvider {
    */
   async queryEntities(entityIds, options = {}) {
     const started = performance.now();
+    const { requestId } = options;
     try {
-      const { requestId } = options;
-
       if (!Array.isArray(entityIds) || entityIds.length === 0) {
         throw new Error('Entity IDs must be a non-empty array');
       }