AI provider management

* OpenAI-compatible provider adapter
* OpenAI support
* LM Studio support
* Ollama OpenAI-compatible support
* Encrypted API-key storage
* Default provider and model selection
* Provider connection testing
* Reusable prompt library
* Prompt variables and templates
* Prompt version field
* AI execution history
* Token-usage storage
* Duration and failure tracking
* Manual knowledge sources
* Knowledge-source chunking
* Knowledge indexing status
* Authenticated AI REST endpoint
* AI administration dashboard
* AI permissions
* Module registration and boot test

Modules/AI/Contracts/AIProviderDriver.php

@@ -0,0 +1,8 @@
+<?php
+namespace Modules\AI\Contracts;
+use Modules\AI\Models\AIProvider;
+interface AIProviderDriver
+{
+    public function generate(AIProvider $provider, array $messages, array $options=[]): array;
+    public function test(AIProvider $provider): array;
+}