refactor: remove CLI dead code

Remove unused daemon installation/uninstallation logic and unnecessary re-exports:
- Delete cli/src/daemon/mac/ directory (macOS LaunchDaemon install/uninstall not used)
- Delete cli/src/daemon/install.ts and uninstall.ts wrappers
- Remove daemon install/uninstall subcommands from cli/src/commands/daemon.ts
- Delete cli/src/api/encryption.ts (misleading name, just base64 encoding)
- Inline base64 encoding directly in cli/src/persistence.ts
- Delete cli/src/modules/common/gitHandlers.ts (unnecessary re-export)
- Update cli/src/modules/common/registerCommonHandlers.ts to import directly from handlers/git

Part of refactoring plan item #1 "删除 CLI 死代码".

cli/src/persistence.ts

@@ -8,7 +8,6 @@ import { FileHandle } from 'node:fs/promises'
 import { readFile, writeFile, mkdir, open, unlink, rename, stat } from 'node:fs/promises'
 import { existsSync, writeFileSync, readFileSync, unlinkSync } from 'node:fs'
 import { configuration } from '@/configuration'
-import { encodeBase64 } from '@/api/encryption';
 import { isProcessAlive } from '@/utils/process';
 
 interface Settings {
@@ -136,7 +135,7 @@ export async function writeCredentialsDataKey(credentials: { publicKey: Uint8Arr
     await mkdir(configuration.happyHomeDir, { recursive: true })
   }
   await writeFile(configuration.privateKeyFile, JSON.stringify({
-    encryption: { publicKey: encodeBase64(credentials.publicKey), machineKey: encodeBase64(credentials.machineKey) },
+    encryption: { publicKey: Buffer.from(credentials.publicKey).toString('base64'), machineKey: Buffer.from(credentials.machineKey).toString('base64') },
     token: credentials.token
   }, null, 2));
 }