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/usage/getting-started.mdx

@@ -1,3 +1,8 @@
+---
+title: "Getting Started"
+description: "Learn how Claude-Mem works automatically in the background"
+---
+
 # Getting Started with Claude-Mem
 
 ## Automatic Operation
@@ -166,6 +171,6 @@ When you use `/clear`, the session doesn't end - it continues with a new prompt
 
 ## Next Steps
 
-- [MCP Search Tools](search-tools.md) - Learn how to search your project history
-- [Architecture Overview](../architecture/overview.md) - Understand how it works
-- [Troubleshooting](../troubleshooting.md) - Common issues and solutions
+- [MCP Search Tools](/usage/search-tools) - Learn how to search your project history
+- [Architecture Overview](/architecture/overview) - Understand how it works
+- [Troubleshooting](/troubleshooting) - Common issues and solutions

docs/usage/search-tools.mdx

@@ -1,3 +1,8 @@
+---
+title: "MCP Search Tools"
+description: "Query your project history with 7 specialized search tools"
+---
+
 # MCP Search Tools Usage
 
 Once claude-mem is installed as a plugin, 7 search tools become available in your Claude Code sessions for querying project history.
@@ -416,6 +421,6 @@ search_sessions with query="[YOUR PROJECT NAME]" and orderBy="date_desc"
 
 ## Next Steps
 
-- [MCP Search Architecture](../architecture/mcp-search.md) - Technical details
-- [Database Schema](../architecture/database.md) - Understanding the data
-- [Getting Started](getting-started.md) - Automatic operation
+- [MCP Search Architecture](/architecture/mcp-search) - Technical details
+- [Database Schema](/architecture/database) - Understanding the data
+- [Getting Started](/usage/getting-started) - Automatic operation