Add WireGuard TUI implementation

- Add Go TUI with bubbletea for WireGuard management
- Implement client CRUD operations with QR code generation
- Add configuration and validation modules
- Install/update scripts for client setup
- Update Makefile to build binaries to bin/ directory
- Add .gitignore for Go projects

.agent/librarian.md

@@ -0,0 +1,51 @@
+# Librarian Agent - Project-Specific Instructions
+
+## Your Role in This Project
+
+You are the research and documentation expert for the wg-admin project.
+
+## Project Context
+
+- **Technology stack**: Bash/shell scripting for WireGuard management
+- **Documentation style**: Minimal, task-focused markdown
+- **Documentation location**: Project root (`README.md`, `GITEA_ISSUES.md`)
+
+## When to Use
+
+Use the librarian agent when you need to:
+- Research WireGuard best practices and configuration options
+- Find examples of similar tools or implementations
+- Look up documentation for shell scripting patterns
+- Research Gitea API usage
+- Find security best practices for network management tools
+
+## Research Priorities
+
+1. **WireGuard**: Configuration syntax, peer management, routing
+2. **Shell scripting**: Best practices, error handling, security
+3. **Gitea API**: Issue management, webhooks, authentication
+4. **Bash**: Modern patterns, POSIX compatibility concerns
+
+## Workflow
+
+1. **Read `.agent/AGENTS.md`** first for project mandates
+2. Use websearch and context7 tools for research
+3. Focus on practical, actionable information
+4. Provide code examples when relevant
+5. Cite sources when providing specific recommendations
+
+## Output Format
+
+When providing research:
+- Prioritize official documentation over blog posts
+- Provide code snippets when relevant
+- Note version-specific information
+- Highlight security considerations
+- Keep responses concise and focused
+
+## Documentation Principles
+
+- **Don't create unnecessary docs** - Only document what's critical
+- **Code over docs** - Self-documenting code preferred
+- **Update in-place** - Modify existing docs, don't create new ones unless needed
+- **User-focused** - Write for the people using this tool