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.

webui/src/components/settings/shared/ModelControls.tsx

@@ -52,6 +52,7 @@ const DEFERRED_MODEL_LIST_PROVIDERS = new Set([
   "novita",
   "ollama",
   "openrouter",
+  "orcarouter",
   "ovms",
   "siliconflow",
   "vllm",
@@ -577,6 +578,7 @@ export function optionRowsWithCurrent(
 export const PROVIDER_ICONS: Record<string, LucideIcon> = {
   custom: Hexagon,
   openrouter: Sparkles,
+  orcarouter: Sparkles,
   skywork: Sparkles,
   aihubmix: Triangle,
   anthropic: Brain,

webui/src/lib/provider-brand.ts

@@ -184,6 +184,7 @@ const PROVIDER_BRANDS: Record<string, ProviderBrand> = {
   ollama: brand("ollama.com", "#111827", "O"),
   openai: brand("openai.com", "#111827", "AI"),
   openrouter: brand("openrouter.ai", "#111827", "OR"),
+  orcarouter: brand("orcarouter.ai", "#111827", "OR"),
   ovms: brand("openvino.ai", "#0071C5", "OV"),
   qianfan: brand("cloud.baidu.com", "#2932E1", "QF"),
   searxng: brand("searxng.org", "#3050FF", "SX"),