feat(nvidia): add NVIDIA provider with onboarding flow (#71204)

* feat(nvidia): add NVIDIA provider with onboarding flow

Add the NVIDIA build.nvidia.com API as a bundled provider. Default model
is nvidia/nvidia/nemotron-3-super-120b-a12b: first segment is the provider
id, remaining "nvidia/nemotron-3-super-120b-a12b" is the literal upstream
model id (which happens to start with "nvidia/" because NVIDIA is also the
model maker).

Supporting core change: introduce a provider capability flag
nativeIdsIncludeProviderPrefix so providers whose native catalog ids
intentionally include their provider prefix (OpenRouter) opt into self-prefix
dedupe in modelKey, without hardcoding provider names in core. Providers
whose ids merely happen to start with their own name (NVIDIA) leave the flag
unset and get the full <provider>/<model-id> concatenation.

- extensions/nvidia/*: new plugin, catalog, onboarding, tests, docs
- extensions/openrouter/index.ts: declare nativeIdsIncludeProviderPrefix
- src/plugins/types.ts: add field to ProviderPlugin
- src/plugins/registry.ts: populate self-prefix set on registration
- src/agents/provider-self-prefix.ts: sync accessor used by modelKey
- src/agents/model-ref-shared.ts: modelKey consults the flag
- test updates for affected surfaces

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* refactor(model-picker): simplify literal-prefix display to label-only

* fix(model-picker): pass workspaceDir/env to allowlist literal-prefix resolution

* chore: untrack generated baseline JSON artifacts (gitignored)

* fix(nvidia): show literal model ref in picker and onboarding notes

* fix(nvidia): show hint whenever display label differs from stored config

* fix(nvidia): drop redundant hint from Keep current label

* fix(nvidia): restore literal double-prefix display labels

* fix(picker): handle literal-prefix fast path

* fix(picker): show literal keep label

* fix(docs): update nvidia provider docs

* fix(nvidia): update test helper imports

* fix(changelog): add nvidia provider entry

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/providers/nvidia.md

@@ -19,7 +19,7 @@ open models for free. Authenticate with an API key from
   <Step title="Export the key and run onboarding">
     ```bash
     export NVIDIA_API_KEY="nvapi-..."
-    openclaw onboard --auth-choice skip
+    openclaw onboard --auth-choice nvidia-api-key
     ```
   </Step>
   <Step title="Set an NVIDIA model">
@@ -30,10 +30,17 @@ open models for free. Authenticate with an API key from
 </Steps>
 
 <Warning>
-If you pass `--token` instead of the env var, the value lands in shell history and
-`ps` output. Prefer the `NVIDIA_API_KEY` environment variable when possible.
+If you pass `--nvidia-api-key` instead of the env var, the value lands in shell
+history and `ps` output. Prefer the `NVIDIA_API_KEY` environment variable when
+possible.
 </Warning>
 
+For non-interactive setup, you can also pass the key directly:
+
+```bash
+openclaw onboard --auth-choice nvidia-api-key --nvidia-api-key "nvapi-..."
+```
+
 ## Config example
 
 ```json5