Enhance code standards, update contributing guidelines, and add tests for SYNC plugin functionality

.github/skills/code-standards/SKILL.md

@@ -5,12 +5,12 @@ description: NetAlertX coding standards and conventions. Use this when writing c
 
 # Code Standards
 
-- ask me to review before going to each next step (mention n step out of x)
-- before starting, prepare implementation plan
+- ask me to review before going to each next step (mention n step out of x)  (AI only)
+- before starting, prepare implementation plan  (AI only)
 - ask me to review it and ask any clarifying questions first
 - add test creation as last step - follow repo architecture patterns - do not place in the root of /test
 - code has to be maintainable, no duplicate code
-- follow DRY principle
+- follow DRY principle - maintainability of code is more important than speed of implementation
 - code files should be less than 500 LOC for better maintainability
 
 ## File Length

.github/workflows/run-all-tests.yml

@@ -3,6 +3,10 @@ name: 🧪 Manual Test Suite Selector
 on:
   workflow_dispatch:
     inputs:
+      run_all:
+        description: '✅ Run ALL tests (overrides individual selectors)'
+        type: boolean
+        default: false
       run_scan:
         description: '📂 scan/ (Scan, Logic, Locks, IPs)'
         type: boolean
@@ -23,6 +27,10 @@ on:
         description: '📂 ui/ (Selenium & Dashboard)'
         type: boolean
         default: false
+      run_plugins:
+        description: '📂 plugins/ (Sync insert schema-aware logic)'
+        type: boolean
+        default: false
       run_root_files:
         description: '📄 Root Test Files (WOL, Atomicity, etc.)'
         type: boolean
@@ -42,12 +50,20 @@ jobs:
         id: builder
         run: |
           PATHS=""
+
+          # run_all overrides everything
+          if [ "${{ github.event.inputs.run_all }}" == "true" ]; then
+            echo "final_paths=test/" >> $GITHUB_OUTPUT
+            exit 0
+          fi
+
           # Folder Mapping with 'test/' prefix
           if [ "${{ github.event.inputs.run_scan }}" == "true" ]; then PATHS="$PATHS test/scan/"; fi
           if [ "${{ github.event.inputs.run_api }}" == "true" ]; then PATHS="$PATHS test/api_endpoints/ test/server/"; fi
           if [ "${{ github.event.inputs.run_backend }}" == "true" ]; then PATHS="$PATHS test/backend/ test/db/"; fi
           if [ "${{ github.event.inputs.run_docker_env }}" == "true" ]; then PATHS="$PATHS test/docker_tests/"; fi
           if [ "${{ github.event.inputs.run_ui }}" == "true" ]; then PATHS="$PATHS test/ui/"; fi
+          if [ "${{ github.event.inputs.run_plugins }}" == "true" ]; then PATHS="$PATHS test/plugins/"; fi
 
           # Root Files Mapping (files sitting directly in /test/)
           if [ "${{ github.event.inputs.run_root_files }}" == "true" ]; then