feat(mcp): add tool presets and audit commands

- Introduce reference MCP presets with installation/audit helpers and remove legacy connector lists.
- Add CLI `owlen tools` commands to install presets or audit configuration, with optional pruning.
- Extend the TUI :tools command to support listing presets, installing them, and auditing current configuration.
- Document the preset workflow and provide regression tests for preset application.

crates/owlen-cli/src/commands/mod.rs

@@ -2,3 +2,4 @@
 
 pub mod cloud;
 pub mod providers;
+pub mod tools;