feat: add Venice AI provider integration

Venice AI is a privacy-focused AI inference provider with support for
uncensored models and access to major proprietary models via their
anonymized proxy.

This integration adds:

- Complete model catalog with 25 models:
  - 15 private models (Llama, Qwen, DeepSeek, Venice Uncensored, etc.)
  - 10 anonymized models (Claude, GPT-5.2, Gemini, Grok, Kimi, MiniMax)
- Auto-discovery from Venice API with fallback to static catalog
- VENICE_API_KEY environment variable support
- Interactive onboarding via 'venice-api-key' auth choice
- Model selection prompt showing all available Venice models
- Provider auto-registration when API key is detected
- Comprehensive documentation covering:
  - Privacy modes (private vs anonymized)
  - All 25 models with context windows and features
  - Streaming, function calling, and vision support
  - Model selection recommendations

Privacy modes:
- Private: Fully private, no logging (open-source models)
- Anonymized: Proxied through Venice (proprietary models)

Default model: venice/llama-3.3-70b (good balance of capability + privacy)
Venice API: https://api.venice.ai/api/v1 (OpenAI-compatible)

src/commands/auth-choice.apply.api-providers.ts

@@ -23,6 +23,8 @@ import {
   applyOpenrouterProviderConfig,
   applySyntheticConfig,
   applySyntheticProviderConfig,
+  applyVeniceConfig,
+  applyVeniceProviderConfig,
   applyVercelAiGatewayConfig,
   applyVercelAiGatewayProviderConfig,
   applyZaiConfig,
@@ -30,6 +32,7 @@ import {
   MOONSHOT_DEFAULT_MODEL_REF,
   OPENROUTER_DEFAULT_MODEL_REF,
   SYNTHETIC_DEFAULT_MODEL_REF,
+  VENICE_DEFAULT_MODEL_REF,
   VERCEL_AI_GATEWAY_DEFAULT_MODEL_REF,
   setGeminiApiKey,
   setKimiCodeApiKey,
@@ -37,6 +40,7 @@ import {
   setOpencodeZenApiKey,
   setOpenrouterApiKey,
   setSyntheticApiKey,
+  setVeniceApiKey,
   setVercelAiGatewayApiKey,
   setZaiApiKey,
   ZAI_DEFAULT_MODEL_REF,
@@ -77,6 +81,8 @@ export async function applyAuthChoiceApiProviders(
       authChoice = "zai-api-key";
     } else if (params.opts.tokenProvider === "synthetic") {
       authChoice = "synthetic-api-key";
+    } else if (params.opts.tokenProvider === "venice") {
+      authChoice = "venice-api-key";
     } else if (params.opts.tokenProvider === "opencode") {
       authChoice = "opencode-zen";
     }
@@ -457,6 +463,65 @@ export async function applyAuthChoiceApiProviders(
     return { config: nextConfig, agentModelOverride };
   }
 
+  if (authChoice === "venice-api-key") {
+    let hasCredential = false;
+
+    if (!hasCredential && params.opts?.token && params.opts?.tokenProvider === "venice") {
+      await setVeniceApiKey(normalizeApiKeyInput(params.opts.token), params.agentDir);
+      hasCredential = true;
+    }
+
+    if (!hasCredential) {
+      await params.prompter.note(
+        [
+          "Venice AI provides privacy-focused inference with uncensored models.",
+          "Get your API key at: https://venice.ai/settings/api",
+          "Supports 'private' (fully private) and 'anonymized' (proxy) modes.",
+        ].join("\n"),
+        "Venice AI",
+      );
+    }
+
+    const envKey = resolveEnvApiKey("venice");
+    if (envKey) {
+      const useExisting = await params.prompter.confirm({
+        message: `Use existing VENICE_API_KEY (${envKey.source}, ${formatApiKeyPreview(envKey.apiKey)})?`,
+        initialValue: true,
+      });
+      if (useExisting) {
+        await setVeniceApiKey(envKey.apiKey, params.agentDir);
+        hasCredential = true;
+      }
+    }
+    if (!hasCredential) {
+      const key = await params.prompter.text({
+        message: "Enter Venice AI API key",
+        validate: validateApiKeyInput,
+      });
+      await setVeniceApiKey(normalizeApiKeyInput(String(key)), params.agentDir);
+    }
+    nextConfig = applyAuthProfileConfig(nextConfig, {
+      profileId: "venice:default",
+      provider: "venice",
+      mode: "api_key",
+    });
+    {
+      const applied = await applyDefaultModelChoice({
+        config: nextConfig,
+        setDefaultModel: params.setDefaultModel,
+        defaultModel: VENICE_DEFAULT_MODEL_REF,
+        applyDefaultConfig: applyVeniceConfig,
+        applyProviderConfig: applyVeniceProviderConfig,
+        noteDefault: VENICE_DEFAULT_MODEL_REF,
+        noteAgentModel,
+        prompter: params.prompter,
+      });
+      nextConfig = applied.config;
+      agentModelOverride = applied.agentModelOverride ?? agentModelOverride;
+    }
+    return { config: nextConfig, agentModelOverride };
+  }
+
   if (authChoice === "opencode-zen") {
     let hasCredential = false;
     if (!hasCredential && params.opts?.token && params.opts?.tokenProvider === "opencode") {