Add AI writing assistant plugin with local backend, brave search, and image generation support

- Implement local backend AI provider with Ollama integration
- Add Brave Search API integration for real-time search suggestions
- Add image generation manager with multiple AI providers
- Create hybrid provider system with local/cloud fallback
- Add comprehensive settings UI with provider management
- Implement Gutenberg sidebar with writing assistance controls
- Add SEO schema generation for AI-generated content
- Multiple provider support: OpenRouter, local backend, Codex

downloads/agentic-writer-local-backend/stop-proxy.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+if [ -f proxy.pid ]; then
+    PID=$(cat proxy.pid)
+    if kill -0 $PID 2>/dev/null; then
+        kill $PID
+        rm proxy.pid
+        echo "🛑 Local Backend stopped (PID: $PID)"
+    else
+        echo "⚠️  No process found with PID: $PID"
+        rm proxy.pid
+    fi
+else
+    # Fallback: kill by process name
+    pkill -f claude-proxy.js
+    if [ $? -eq 0 ]; then
+        echo "🛑 Stopped all claude-proxy processes"
+    else
+        echo "ℹ️  No claude-proxy processes running"
+    fi
+fi