fix(nvidia): use correct NVIDIA_API_KEY environment variable

- Fixes the environment variable name from `NVIDIA_NIM_API_KEY` to `NVIDIA_API_KEY` to match NVIDIA's official documentation
- Adds model suggestions for NVIDIA NIM provider in the onboarding wizard

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/onboard/wizard.rs

@@ -1276,7 +1276,7 @@ fn setup_provider(workspace_dir: &Path) -> Result<(String, String, String)> {
     // ── Tier selection ──
     let tiers = vec![
         "⭐ Recommended (OpenRouter, Venice, Anthropic, OpenAI, Gemini)",
-        "⚡ Fast inference (Groq, Fireworks, Together AI)",
+        "⚡ Fast inference (Groq, Fireworks, Together AI, NVIDIA NIM)",
         "🌐 Gateway / proxy (Vercel AI, Cloudflare AI, Amazon Bedrock)",
         "🔬 Specialized (Moonshot/Kimi, GLM/Zhipu, MiniMax, Qianfan, Z.AI, Synthetic, OpenCode Zen, Cohere)",
         "🏠 Local / private (Ollama — no API key needed)",
@@ -1311,6 +1311,7 @@ fn setup_provider(workspace_dir: &Path) -> Result<(String, String, String)> {
             ("groq", "Groq — ultra-fast LPU inference"),
             ("fireworks", "Fireworks AI — fast open-source inference"),
             ("together-ai", "Together AI — open-source model hosting"),
+            ("nvidia", "NVIDIA NIM — DeepSeek, Llama, & more"),
         ],
         2 => vec![
             ("vercel", "Vercel AI Gateway"),
@@ -1452,6 +1453,7 @@ fn setup_provider(workspace_dir: &Path) -> Result<(String, String, String)> {
             "minimax" => "https://www.minimaxi.com/user-center/basic-information",
             "vercel" => "https://vercel.com/account/tokens",
             "cloudflare" => "https://dash.cloudflare.com/profile/api-tokens",
+            "nvidia" | "nvidia-nim" | "build.nvidia.com" => "https://build.nvidia.com/",
             "bedrock" => "https://console.aws.amazon.com/iam",
             "gemini" => "https://aistudio.google.com/app/apikey",
             _ => "",
@@ -1573,6 +1575,12 @@ fn setup_provider(workspace_dir: &Path) -> Result<(String, String, String)> {
             ),
             ("mistralai/Mixtral-8x22B-Instruct-v0.1", "Mixtral 8x22B"),
         ],
+        "nvidia" | "nvidia-nim" | "build.nvidia.com" => vec![
+            ("deepseek-ai/DeepSeek-R1", "DeepSeek R1 (reasoning)"),
+            ("meta/llama-3.1-70b-instruct", "Llama 3.1 70B Instruct"),
+            ("mistralai/Mistral-7B-Instruct-v0.3", "Mistral 7B Instruct"),
+            ("meta/llama-3.1-405b-instruct", "Llama 3.1 405B Instruct"),
+        ],
         "cohere" => vec![
             ("command-r-plus", "Command R+ (flagship)"),
             ("command-r", "Command R (fast)"),
@@ -1796,6 +1804,7 @@ fn provider_env_var(name: &str) -> &'static str {
         "cloudflare" | "cloudflare-ai" => "CLOUDFLARE_API_KEY",
         "bedrock" | "aws-bedrock" => "AWS_ACCESS_KEY_ID",
         "gemini" => "GEMINI_API_KEY",
+        "nvidia" | "nvidia-nim" | "build.nvidia.com" => "NVIDIA_API_KEY",
         _ => "API_KEY",
     }
 }
@@ -4460,6 +4469,9 @@ mod tests {
         assert_eq!(provider_env_var("google"), "GEMINI_API_KEY"); // alias
         assert_eq!(provider_env_var("google-gemini"), "GEMINI_API_KEY"); // alias
         assert_eq!(provider_env_var("gemini"), "GEMINI_API_KEY");
+        assert_eq!(provider_env_var("nvidia"), "NVIDIA_API_KEY");
+        assert_eq!(provider_env_var("nvidia-nim"), "NVIDIA_API_KEY"); // alias
+        assert_eq!(provider_env_var("build.nvidia.com"), "NVIDIA_API_KEY"); // alias
     }
 
     #[test]

src/providers/mod.rs

@@ -130,6 +130,7 @@ fn resolve_api_key(name: &str, api_key: Option<&str>) -> Option<String> {
             vec!["DASHSCOPE_API_KEY"]
         }
         "zai" | "z.ai" => vec!["ZAI_API_KEY"],
+        "nvidia" | "nvidia-nim" | "build.nvidia.com" => vec!["NVIDIA_API_KEY"],
         "synthetic" => vec!["SYNTHETIC_API_KEY"],
         "opencode" | "opencode-zen" => vec!["OPENCODE_API_KEY"],
         "vercel" | "vercel-ai" => vec!["VERCEL_API_KEY"],
@@ -279,6 +280,9 @@ pub fn create_provider(name: &str, api_key: Option<&str>) -> anyhow::Result<Box<
         "copilot" | "github-copilot" => Ok(Box::new(OpenAiCompatibleProvider::new(
             "GitHub Copilot", "https://api.githubcopilot.com", key, AuthStyle::Bearer,
         ))),
+        "nvidia" | "nvidia-nim" | "build.nvidia.com" => Ok(Box::new(OpenAiCompatibleProvider::new(
+            "NVIDIA NIM", "https://integrate.api.nvidia.com/v1", key, AuthStyle::Bearer,
+        ))),
 
         // ── Bring Your Own Provider (custom URL) ───────────
         // Format: "custom:https://your-api.com" or "custom:http://localhost:1234"
@@ -603,6 +607,13 @@ mod tests {
         assert!(create_provider("github-copilot", Some("key")).is_ok());
     }
 
+    #[test]
+    fn factory_nvidia() {
+        assert!(create_provider("nvidia", Some("nvapi-test")).is_ok());
+        assert!(create_provider("nvidia-nim", Some("nvapi-test")).is_ok());
+        assert!(create_provider("build.nvidia.com", Some("nvapi-test")).is_ok());
+    }
+
     // ── Custom / BYOP provider ─────────────────────────────
 
     #[test]
@@ -792,6 +803,7 @@ mod tests {
             "perplexity",
             "cohere",
             "copilot",
+            "nvidia",
         ];
         for name in providers {
             assert!(