Feat/local-plugin (#1125)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit


• New Features  
 - Enhanced the login experience with improved session management and
two-factor authentication.
 - Introduced a comprehensive README for the Unraid Plugin Builder,
detailing development workflows and commands.

• Chores  
 - Streamlined build, packaging, and deployment processes with updated
dependency and environment configurations.
 - Updated Docker configurations to support pnpm as the package manager.
 - Added new environment variables for better configuration management.
 - Introduced new scripts for improved build and packaging processes.  

• Tests  
 - Removed outdated test cases and simplified test setups.  

• Refactor  
 - Modernized internal code structure and asynchronous handling for
improved overall performance.
 - Transitioned imports from lodash to lodash-es for better module
handling.
 - Updated environment variable management and configuration settings.  
 - Enhanced the build script for improved deployment processes.  
 - Updated the notification handling structure to improve efficiency.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

plugin/.env.example

@@ -1,8 +1,6 @@
-# API version in semver format (required)
-API_VERSION=3.11.1
-# SHA256 hash of the API package (required)
-API_SHA256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
 # Pull request number for PR builds (optional)
 PR=35
-# Skip source validation (default: true for local testing)
-SKIP_SOURCE_VALIDATION=true
+# Skip validation (default: true for local testing)
+SKIP_VALIDATION=true
+# Local file server URL (optional)
+LOCAL_FILESERVER_URL=http://192.168.1.100:8080