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/Config/config.php

@@ -0,0 +1,8 @@
+<?php
+return [
+    'default_provider' => env('AI_DEFAULT_PROVIDER'),
+    'timeout' => (int) env('AI_TIMEOUT', 60),
+    'max_output_tokens' => (int) env('AI_MAX_OUTPUT_TOKENS', 2048),
+    'temperature' => (float) env('AI_TEMPERATURE', 0.3),
+    'retain_executions_days' => (int) env('AI_RETAIN_EXECUTIONS_DAYS', 90),
+];