feat(providers): add OrcaRouter (OpenAI-compatible routing gateway) (#4070)

Integrado em release/v3.8.28. Adiciona o provider OrcaRouter (OpenAI-compatible, API-key, DefaultExecutor). Ajuste de review: rebaseline de file-size de providers.ts 3147→3159 (+12 da entrada OrcaRouter). Validado local no tree sincronizado: provider-consistency ✓, docs-counts STRICT 227 ✓, typecheck:core ✓, teste 3/3 ✓, eslint ✓; semgrep + semgrep-cloud verdes. Fast QG/dast enfileirados (saturação de runner) — merge nos gates de política verificados (precedente #4034/#4065).

src/shared/constants/providers.ts

@@ -662,6 +662,18 @@ export const APIKEY_PROVIDERS = {
     hasFree: true,
     freeNote: "Free models at $0/token with :free suffix - 20 RPM / 200 RPD",
   },
+  orcarouter: {
+    id: "orcarouter",
+    alias: "orcarouter",
+    name: "OrcaRouter",
+    icon: "router",
+    color: "#0891B2",
+    textIcon: "ORC",
+    passthroughModels: true,
+    website: "https://www.orcarouter.ai",
+    apiHint:
+      "Create an API key (starts with sk-orca-) at https://www.orcarouter.ai, then paste it as a Bearer token. OpenAI-compatible endpoint at https://api.orcarouter.ai/v1.",
+  },
   "api-airforce": {
     id: "api-airforce",
     alias: "af",