feat(provider): add AdaL (SylphAI) as a built-in provider

Add AdaL CLI by SylphAI as a new provider option in ForgeCode. AdaL is
registered as an OpenAI-compatible provider with api.sylph.ai endpoints,
enabling ForgeCode users to access AdaL's models via API key auth.

Changes:
- Add 'adal' entry to provider.json with OpenAI response type
- Add ProviderId::ADAL constant to forge_domain
- Wire up display_name ("AdaL"), FromStr, and built_in_providers()

Co-Authored-By: ForgeCode <noreply@forgecode.dev>

Author: chindris-mihai-alexandru

crates/forge_domain/src/provider.rs

@@ -73,6 +73,7 @@ impl ProviderId {
     pub const FIREWORKS_AI: ProviderId = ProviderId(Cow::Borrowed("fireworks-ai"));
     pub const NOVITA: ProviderId = ProviderId(Cow::Borrowed("novita"));
     pub const GOOGLE_AI_STUDIO: ProviderId = ProviderId(Cow::Borrowed("google_ai_studio"));
+    pub const ADAL: ProviderId = ProviderId(Cow::Borrowed("adal"));
 
     /// Returns all built-in provider IDs
     ///
@@ -106,6 +107,7 @@ impl ProviderId {
             ProviderId::FIREWORKS_AI,
             ProviderId::NOVITA,
             ProviderId::GOOGLE_AI_STUDIO,
+            ProviderId::ADAL,
         ]
     }
 
@@ -132,6 +134,7 @@ impl ProviderId {
             "fireworks-ai" => "FireworksAI".to_string(),
             "novita" => "Novita".to_string(),
             "google_ai_studio" => "GoogleAIStudio".to_string(),
+            "adal" => "AdaL".to_string(),
             _ => {
                 // For other providers, use UpperCamelCase conversion
                 use convert_case::{Case, Casing};
@@ -177,6 +180,7 @@ impl std::str::FromStr for ProviderId {
             "fireworks-ai" => ProviderId::FIREWORKS_AI,
             "novita" => ProviderId::NOVITA,
             "google_ai_studio" => ProviderId::GOOGLE_AI_STUDIO,
+            "adal" => ProviderId::ADAL,
             // For custom providers, use Cow::Owned to avoid memory leaks
             custom => ProviderId(Cow::Owned(custom.to_string())),
         };

crates/forge_repo/src/provider/provider.json

@@ -3099,5 +3099,14 @@
         "input_modalities": ["text"]
       }
     ]
+  },
+  {
+    "id": "adal",
+    "api_key_vars": "ADAL_API_KEY",
+    "url_param_vars": [],
+    "response_type": "OpenAI",
+    "url": "https://api.sylph.ai/v1/chat/completions",
+    "models": "https://api.sylph.ai/v1/models",
+    "auth_methods": ["api_key"]
   }
 ]