Update Mintlify documentation for Phase 2 completion

📚 Documentation updates reflecting REST API completion:

✅ Updated REST API feature page:
- Added Phase 2 completion notice
- Updated features list with current capabilities
- Replaced generic instructions with actual implementation
- Added comprehensive usage examples (cURL, Python, JavaScript)
- Included testing information and interactive docs links

✅ Updated introduction page:
- Changed status from Phase 1 to Phase 2 complete
- Added REST API to component status table
- Updated API accordion with completion status
- Added REST API server card with direct link

✅ Updated quickstart guide:
- Added Step 3: REST API server startup
- Added Step 4: API testing instructions
- Included specific commands and endpoints

🎯 All documentation now accurately reflects Phase 2 completion
📊 Users can follow updated guides to use the functional API

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

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

docs/introduction.mdx

@@ -41,11 +41,11 @@ The Mem0 Memory System is a comprehensive, self-hosted memory layer designed for
     Advanced relationship mapping with Neo4j for contextual memory connections
   </Card>
   <Card
-    title="MCP Integration"
-    icon="link"
-    href="/guides/mcp-integration"
+    title="REST API Server ✅"
+    icon="code"
+    href="/open-source/features/rest-api"
   >
-    Model Context Protocol server for Claude Code and other AI tools
+    Production-ready FastAPI server with authentication, rate limiting, and comprehensive testing
   </Card>
 </CardGroup>
 
@@ -64,8 +64,8 @@ The Mem0 Memory System is a comprehensive, self-hosted memory layer designed for
     Full Ollama integration with 20+ local models including Llama, Qwen, and specialized embedding models.
   </Accordion>
 
-  <Accordion title="API-First Design">
-    RESTful API with comprehensive memory operations, authentication, and rate limiting.
+  <Accordion title="REST API Complete ✅">
+    Production-ready FastAPI server with comprehensive memory operations, authentication, rate limiting, and testing suites.
   </Accordion>
 
   <Accordion title="Self-Hosted Privacy">
@@ -89,10 +89,10 @@ graph TB
     G --> I[OpenAI/Remote]
 ```
 
-## Current Status: Phase 1 Complete ✅
+## Current Status: Phase 2 Complete ✅
 
 <Note>
-  **Foundation Ready**: All core infrastructure components are operational and tested.
+  **REST API Ready**: Complete FastAPI implementation with authentication, testing, and documentation.
 </Note>
 
 | Component | Status | Description |
@@ -101,6 +101,7 @@ graph TB
 | **Supabase** | ✅ Ready | Self-hosted database with pgvector on localhost:8000 |
 | **Ollama** | ✅ Ready | 21+ local models available on localhost:11434 |
 | **Mem0 Core** | ✅ Ready | Memory management system v0.1.115 |
+| **REST API** | ✅ Ready | FastAPI server with full CRUD, auth, and testing on localhost:8080 |
 
 ## Getting Started