feat: Refactor service management scripts to use a unified dev script

- Added package.json to manage development scripts.
- Updated restart-services.ps1 to call the new dev script for starting services.
- Refactored start-admin.ps1, start-backend.ps1, start-frontend.ps1, and start-mcp.ps1 to utilize the dev script for starting respective services.
- Enhanced stop-services.ps1 to improve process termination logic by matching command patterns.

backend/Cargo.toml

@@ -45,6 +45,7 @@ tower-http = { version = "0.6", features = ["cors"] }
 reqwest = { version = "0.12", default-features = false, features = ["blocking", "json", "rustls-tls"] }
 fastembed = "5.1"
 async-stream = "0.3"
+base64 = "0.22"
 
 [[bin]]
 name = "termi_api-cli"