laravel-ai-multi-providerlisted

# Laravel AI Multi-Provider + Fallback Single `AiService` routes to configured provider; on retryable failures, walks a **fallback chain** (same provider alt models → cross-provider plan in config). ## When to use - Production AI features that must survive free-tier quota exhaustion - Chat + vision share one fallback infrastructure - User-friendly errors instead of raw API JSON ## Stack - Laravel 10, Guzzle/Http facade - Settings from `laravel-json-ai-settings` - Config: `config/ai.php` → `fallback_plan`, `fallback_models`, `label_scan.vision_models` ## Architecture ``` User message / image → primary provider + model (from settings) → executeWithFallbackChain(mode, provider, model, invoke) → buildFallbackChain('chat'|'label_scan', ...) → foreach step: skip if no API key; try invoke; catch retryable → next → formatAiErrorMessage() on final failure ``` ## Config: fallback_plan ```php 'fallback_plan' => [ 'enabled' => true, 'chat' => [ ['provider' => 'openrouter', 'models' => ['openrouter/free', 'meta-llama/llama-3.3-70b-instruct:free']], ['provider' => 'gemini', 'models' => ['gemini-2.5-flash-lite', 'gemini-2.0-flash-lite']], ], 'label_scan' => [ ['provider' => 'openrouter', 'models' => ['openrouter/free', 'nvidia/nemotron-nano-12b-v2-vl:free']], ['provider' => 'gemini', 'models' => ['gemini-2.5-flash-lite', 'gemini-2.5-flash']], ], ], ``` ## Retryable errors Treat as fallback-worthy (cas