feat: Add Kilo Gateway provider (#20212)

* feat: Add Kilo Gateway provider

Add support for Kilo Gateway as a model provider, similar to OpenRouter.
Kilo Gateway provides a unified API that routes requests to many models
behind a single endpoint and API key.

Changes:
- Add kilocode provider option to auth-choice and onboarding flows
- Add KILOCODE_API_KEY environment variable support
- Add kilocode/ model prefix handling in model-auth and extra-params
- Add provider documentation in docs/providers/kilocode.md
- Update model-providers.md with Kilo Gateway section
- Add design doc for the integration

* kilocode: add provider tests and normalize onboard auth-choice registration

* kilocode: register in resolveImplicitProviders so models appear in provider filter

* kilocode: update base URL from /api/openrouter/ to /api/gateway/

* docs: fix formatting in kilocode docs

* fix: address PR review — remove kilocode from cacheRetention, fix stale model refs and CLI name in docs, fix TS2742

* docs: fix stale refs in design doc — Moltbot to OpenClaw, MoltbotConfig to OpenClawConfig, remove extra-params section, fix doc path

* fix: use resolveAgentModelPrimaryValue for AgentModelConfig union type

---------

Co-authored-by: Mark IJbema <mark@kilocode.ai>

src/commands/onboard-auth.ts

@@ -9,6 +9,8 @@ export {
   applyCloudflareAiGatewayProviderConfig,
   applyHuggingfaceConfig,
   applyHuggingfaceProviderConfig,
+  applyKilocodeConfig,
+  applyKilocodeProviderConfig,
   applyQianfanConfig,
   applyQianfanProviderConfig,
   applyKimiCodeConfig,
@@ -37,6 +39,7 @@ export {
   applyXiaomiProviderConfig,
   applyZaiConfig,
   applyZaiProviderConfig,
+  KILOCODE_BASE_URL,
 } from "./onboard-auth.config-core.js";
 export {
   applyMinimaxApiConfig,
@@ -55,12 +58,14 @@ export {
 } from "./onboard-auth.config-opencode.js";
 export {
   CLOUDFLARE_AI_GATEWAY_DEFAULT_MODEL_REF,
+  KILOCODE_DEFAULT_MODEL_REF,
   LITELLM_DEFAULT_MODEL_REF,
   OPENROUTER_DEFAULT_MODEL_REF,
   setAnthropicApiKey,
   setCloudflareAiGatewayConfig,
   setQianfanApiKey,
   setGeminiApiKey,
+  setKilocodeApiKey,
   setLitellmApiKey,
   setKimiCodingApiKey,
   setMinimaxApiKey,
@@ -86,12 +91,14 @@ export {
   XAI_DEFAULT_MODEL_REF,
 } from "./onboard-auth.credentials.js";
 export {
+  buildKilocodeModelDefinition,
   buildMinimaxApiModelDefinition,
   buildMinimaxModelDefinition,
   buildMistralModelDefinition,
   buildMoonshotModelDefinition,
   buildZaiModelDefinition,
   DEFAULT_MINIMAX_BASE_URL,
+  KILOCODE_DEFAULT_MODEL_ID,
   MOONSHOT_CN_BASE_URL,
   QIANFAN_BASE_URL,
   QIANFAN_DEFAULT_MODEL_ID,