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/Models/AIExecution.php

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+<?php
+namespace Modules\AI\Models;
+use Illuminate\Database\Eloquent\Model;
+final class AIExecution extends Model
+{
+    protected $fillable=['execution_id','ai_provider_id','ai_prompt_id','user_id','model','purpose','input','output','context','usage','status','error','duration_ms','completed_at'];
+    protected $casts=['context'=>'array','usage'=>'array','completed_at'=>'datetime'];
+}

Modules/AI/Models/AIKnowledgeChunk.php

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+<?php
+namespace Modules\AI\Models;
+use Illuminate\Database\Eloquent\Model;
+final class AIKnowledgeChunk extends Model
+{
+    protected $fillable=['ai_knowledge_source_id','position','content','metadata'];
+    protected $casts=['metadata'=>'array'];
+}

Modules/AI/Models/AIKnowledgeSource.php

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+<?php
+namespace Modules\AI\Models;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+final class AIKnowledgeSource extends Model
+{
+    protected $fillable=['name','source_kind','source_type','source_id','content','checksum','metadata','status','chunk_count','indexed_at'];
+    protected $casts=['metadata'=>'array','indexed_at'=>'datetime'];
+    public function source(): MorphTo { return $this->morphTo(); }
+    public function chunks(): HasMany { return $this->hasMany(AIKnowledgeChunk::class); }
+}

Modules/AI/Models/AIPrompt.php

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+<?php
+namespace Modules\AI\Models;
+use Illuminate\Database\Eloquent\Model;
+final class AIPrompt extends Model
+{
+    protected $fillable=['name','slug','purpose','system_prompt','user_template','variables','version','is_active','created_by'];
+    protected $casts=['variables'=>'array','is_active'=>'boolean'];
+    public function render(array $variables): string
+    {
+        return preg_replace_callback('/\{\{\s*([\w.]+)\s*\}\}/', fn($m)=>(string)data_get($variables,$m[1],''), $this->user_template) ?? $this->user_template;
+    }
+}

Modules/AI/Models/AIProvider.php

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+<?php
+namespace Modules\AI\Models;
+use Illuminate\Database\Eloquent\Model;
+final class AIProvider extends Model
+{
+    protected $fillable=['name','driver','base_url','api_key','default_model','models','options','is_active','is_default','last_tested_at','last_test_status','last_test_message'];
+    protected $casts=['api_key'=>'encrypted','models'=>'array','options'=>'array','is_active'=>'boolean','is_default'=>'boolean','last_tested_at'=>'datetime'];
+    protected $hidden=['api_key'];
+}