feat: add NVIDIA NIM and MiniMax provider support (#552)

* feat: add NVIDIA NIM and MiniMax provider support

- Add nvidia-nim and minimax to --provider CLI flag
- Add model discovery for NVIDIA NIM (160+ models) and MiniMax
- Update /model picker to show provider-specific models
- Fix provider detection in startup banner
- Update .env.example with new provider options

Supported providers:
- NVIDIA NIM: https://integrate.api.nvidia.com/v1
- MiniMax: https://api.minimax.io/v1

* fix: resolve conflict in StartupScreen (keep NVIDIA/MiniMax + add Codex detection)

* fix: resolve providerProfile conflict (add imports from main, keep NVIDIA/MiniMax)

* fix: revert providerSecrets to match main (NVIDIA/MiniMax handled elsewhere)

* fix: add context window entries for NVIDIA NIM and new MiniMax models

* fix: use GLM-5 as NVIDIA NIM default and MiniMax-M2.5 for consistency

* fix: address remaining review items - add GLM/Kimi context entries, max output tokens, fix .env.example, revert to Nemotron default

* fix: filter NVIDIA NIM picker to chat/instruct models only, set provider-specific API keys from saved profiles

* chore: add more NVIDIA NIM context window entries for popular models

* fix: address remaining non-blocking items - fix base model, clear provider API keys on profile switch

src/utils/providerDiscovery.ts

@@ -105,6 +105,14 @@ export function getLocalOpenAICompatibleProviderLabel(baseUrl?: string): string
     ) {
       return 'text-generation-webui'
     }
+    // Check for NVIDIA NIM
+    if (host.includes('nvidia') || haystack.includes('nvidia') || host.includes('integrate.api.nvidia')) {
+      return 'NVIDIA NIM'
+    }
+    // Check for MiniMax (both api.minimax.io and api.minimax.chat)
+    if (host.includes('minimax') || haystack.includes('minimax')) {
+      return 'MiniMax'
+    }
   } catch {
     // Fall back to the generic label when the base URL is malformed.
   }