refactor: consolidate CLI command definitions to lib.rs

- Move all CLI command enums (ChannelCommands, SkillCommands, CronCommands, IntegrationCommands, MigrateCommands, ServiceCommands) to lib.rs
- Add clap derives for use in main.rs CLI parsing
- Update all modules to use crate:: prefix instead of super:: for command types
- Add mod util; to main.rs for binary compilation
- Export Config type from lib.rs for main.rs

This refactoring eliminates code duplication between library modules and binary, centralizing all CLI command definitions in one place.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/integrations/mod.rs

@@ -67,9 +67,9 @@ pub struct IntegrationEntry {
 }
 
 /// Handle the `integrations` CLI command
-pub fn handle_command(command: super::IntegrationCommands, config: &Config) -> Result<()> {
+pub fn handle_command(command: crate::IntegrationCommands, config: &Config) -> Result<()> {
     match command {
-        super::IntegrationCommands::Info { name } => show_integration_info(config, &name),
+        crate::IntegrationCommands::Info { name } => show_integration_info(config, &name),
     }
 }