feat: add Together AI integration and provider implementation guide

- Create detailed provider implementation guide with:
  - Architecture overview and implementation steps
  - Configuration patterns and best practices
  - Testing checklist and Docker integration guide
  - Example using Together AI implementation
- Add Together AI as new provider with:
  - Environment variables and Docker configuration
  - Support for Qwen, Llama, and Mixtral models
  - API key and base URL management
  - OpenAI-compatible API integration

app/lib/.server/llm/api-key.ts

@@ -35,6 +35,8 @@ export function getAPIKey(cloudflareEnv: Env, provider: string, userApiKeys?: Re
       return env.MISTRAL_API_KEY || cloudflareEnv.MISTRAL_API_KEY;
     case 'OpenAILike':
       return env.OPENAI_LIKE_API_KEY || cloudflareEnv.OPENAI_LIKE_API_KEY;
+    case 'Together':
+      return env.TOGETHER_API_KEY || cloudflareEnv.TOGETHER_API_KEY;
     case 'xAI':
       return env.XAI_API_KEY || cloudflareEnv.XAI_API_KEY;
     case 'Cohere':
@@ -48,6 +50,8 @@ export function getAPIKey(cloudflareEnv: Env, provider: string, userApiKeys?: Re
 
 export function getBaseURL(cloudflareEnv: Env, provider: string) {
   switch (provider) {
+    case 'Together':
+      return env.TOGETHER_API_BASE_URL || cloudflareEnv.TOGETHER_API_BASE_URL;
     case 'OpenAILike':
       return env.OPENAI_LIKE_API_BASE_URL || cloudflareEnv.OPENAI_LIKE_API_BASE_URL;
     case 'LMStudio':

app/lib/.server/llm/model.ts

@@ -146,6 +146,8 @@ export function getModel(provider: string, model: string, env: Env, apiKeys?: Re
       return getGoogleModel(apiKey, model);
     case 'OpenAILike':
       return getOpenAILikeModel(baseURL, apiKey, model);
+    case 'Together':
+      return getOpenAILikeModel(baseURL, apiKey, model);
     case 'Deepseek':
       return getDeepseekModel(apiKey, model);
     case 'Mistral':

app/utils/constants.ts

@@ -259,6 +259,23 @@ const PROVIDER_LIST: ProviderInfo[] = [
     labelForGetApiKey: 'Get LMStudio',
     icon: 'i-ph:cloud-arrow-down',
   },
+  {
+    name: 'Together',
+    staticModels: [
+
+      { name: 'Qwen/Qwen2.5-Coder-32B-Instruct', label: 'Qwen/Qwen2.5-Coder-32B-Instruct', provider: 'Together', maxTokenAllowed: 8000, },
+      {
+        name: 'meta-llama/Llama-3.2-90B-Vision-Instruct-Turbo',
+        label: 'meta-llama/Llama-3.2-90B-Vision-Instruct-Turbo',
+        provider: 'Together',
+        maxTokenAllowed: 8000,
+      },
+
+      { name: 'mistralai/Mixtral-8x7B-Instruct-v0.1', label: 'Mixtral 8x7B Instruct', provider: 'Together', maxTokenAllowed: 8192 },
+
+    ],
+    getApiKeyLink: 'https://api.together.xyz/settings/api-keys',
+  },
 ];
 
 export const DEFAULT_PROVIDER = PROVIDER_LIST[0];