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/migration.rs

@@ -23,9 +23,9 @@ struct MigrationStats {
     renamed_conflicts: usize,
 }
 
-pub async fn handle_command(command: super::MigrateCommands, config: &Config) -> Result<()> {
+pub async fn handle_command(command: crate::MigrateCommands, config: &Config) -> Result<()> {
     match command {
-        super::MigrateCommands::Openclaw { source, dry_run } => {
+        crate::MigrateCommands::Openclaw { source, dry_run } => {
             migrate_openclaw_memory(config, source, dry_run).await
         }
     }