Add initial documentation for Claude-Mem plugin

- Created docs structure including introduction, installation, troubleshooting, and usage guides.
- Added detailed installation instructions with quick start and advanced options.
- Documented the automatic operation of Claude-Mem and its session management features.
- Introduced MCP search tools with usage examples and query strategies.
- Provided troubleshooting steps for common issues related to worker service, hooks, database, and search tools.
- Included system requirements and upgrade notes for transitioning from v3.x to v4.0.0.

docs/architecture/database.mdx

@@ -1,3 +1,8 @@
+---
+title: "Database Architecture"
+description: "SQLite schema, FTS5 search, and data storage"
+---
+
 # Database Architecture
 
 Claude-Mem uses SQLite 3 with the better-sqlite3 native module for persistent storage and FTS5 for full-text search.

docs/architecture/hooks.mdx

@@ -1,3 +1,8 @@
+---
+title: "Plugin Hooks"
+description: "5 lifecycle hooks that power Claude-Mem"
+---
+
 # Plugin Hooks
 
 Claude-Mem integrates with Claude Code through 5 lifecycle hooks that capture events and inject context.

docs/architecture/mcp-search.mdx

@@ -1,3 +1,8 @@
+---
+title: "MCP Search Server"
+description: "7 search tools with examples and usage patterns"
+---
+
 # MCP Search Server
 
 Claude-Mem includes a Model Context Protocol (MCP) server that exposes 7 specialized search tools for querying stored observations and sessions.

docs/architecture/overview.mdx

@@ -1,3 +1,8 @@
+---
+title: "Architecture Overview"
+description: "System components and data flow in Claude-Mem"
+---
+
 # Architecture Overview
 
 ## System Components
@@ -148,13 +153,13 @@ claude-mem/
 ## Component Details
 
 ### 1. Plugin Hooks
-See [hooks.md](hooks.md) for detailed hook documentation.
+See [Plugin Hooks](/architecture/hooks) for detailed hook documentation.
 
 ### 2. Worker Service
-See [worker-service.md](worker-service.md) for HTTP API and endpoints.
+See [Worker Service](/architecture/worker-service) for HTTP API and endpoints.
 
 ### 3. Database Layer
-See [database.md](database.md) for schema and FTS5 search.
+See [Database Architecture](/architecture/database) for schema and FTS5 search.
 
 ### 4. MCP Search Server
-See [mcp-search.md](mcp-search.md) for search tools and examples.
+See [MCP Search Server](/architecture/mcp-search) for search tools and examples.

docs/architecture/worker-service.mdx

@@ -1,3 +1,8 @@
+---
+title: "Worker Service"
+description: "HTTP API and PM2 process management"
+---
+
 # Worker Service
 
 The worker service is a long-running HTTP API built with Express.js and managed by PM2. It processes observations through the Claude Agent SDK separately from hook execution to prevent timeout issues.