feat(providers): add OrcaRouter as a named gateway provider

Registers OrcaRouter (https://www.orcarouter.ai) as a built-in OpenAI-compatible gateway provider mirroring the OpenRouter wiring: registry spec (sk-orca- key prefix, default base URL), ProvidersConfig field, WebUI icon/brand + deferred model list, docs, and tests.

nanobot/channels/websocket/tests/test_websocket_channel.py

@@ -3132,6 +3132,10 @@ async def test_settings_api_returns_safe_subset_and_updates_whitelist(
         assert providers["azure_openai"]["api_key_required"] is False  # AAD auth supported; no static key required
         assert providers["openrouter"]["configured"] is False
         assert providers["openrouter"]["api_key_required"] is True
+        assert providers["orcarouter"]["label"] == "OrcaRouter"
+        assert providers["orcarouter"]["configured"] is False
+        assert providers["orcarouter"]["api_key_required"] is True
+        assert providers["orcarouter"]["default_api_base"] == "https://api.orcarouter.ai/v1"
         assert providers["skywork"]["label"] == "Skywork"
         assert providers["skywork"]["default_api_base"] == "https://api.apifree.ai/agent/v1"
         assert providers["ant_ling"]["label"] == "Ant Ling"

nanobot/config/schema.py

@@ -262,6 +262,7 @@ class ProvidersConfig(Base):
     anthropic: ProviderConfig = Field(default_factory=ProviderConfig)
     openai: ProviderConfig = Field(default_factory=ProviderConfig)
     openrouter: ProviderConfig = Field(default_factory=ProviderConfig)
+    orcarouter: ProviderConfig = Field(default_factory=ProviderConfig)  # OrcaRouter API gateway
     assemblyai: ProviderConfig = Field(default_factory=ProviderConfig)  # AssemblyAI voice transcription
     huggingface: ProviderConfig = Field(default_factory=ProviderConfig)
     skywork: ProviderConfig = Field(default_factory=ProviderConfig)  # Skywork / APIFree API gateway

nanobot/providers/registry.py

@@ -199,6 +199,18 @@ PROVIDERS: tuple[ProviderSpec, ...] = (
         supports_prompt_caching=True,
         gateway_reasoning_style="reasoning_effort",
     ),
+    # OrcaRouter: global gateway, keys start with "sk-orca-"
+    ProviderSpec(
+        name="orcarouter",
+        keywords=("orcarouter",),
+        env_key="ORCAROUTER_API_KEY",
+        display_name="OrcaRouter",
+        backend="openai_compat",
+        is_gateway=True,
+        detect_by_key_prefix="sk-orca-",
+        detect_by_base_keyword="orcarouter",
+        default_api_base="https://api.orcarouter.ai/v1",
+    ),
     # Eden AI: OpenAI-compatible gateway. Models use the "provider/model"
     # naming scheme (e.g. "anthropic/claude-sonnet-4-5"); the full id is sent upstream.
     ProviderSpec(