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/auth-choice.apply.api-providers.ts

@@ -23,6 +23,8 @@ import {
   applyAuthProfileConfig,
   applyCloudflareAiGatewayConfig,
   applyCloudflareAiGatewayProviderConfig,
+  applyKilocodeConfig,
+  applyKilocodeProviderConfig,
   applyQianfanConfig,
   applyQianfanProviderConfig,
   applyKimiCodeConfig,
@@ -50,6 +52,7 @@ import {
   applyZaiConfig,
   applyZaiProviderConfig,
   CLOUDFLARE_AI_GATEWAY_DEFAULT_MODEL_REF,
+  KILOCODE_DEFAULT_MODEL_REF,
   LITELLM_DEFAULT_MODEL_REF,
   QIANFAN_DEFAULT_MODEL_REF,
   KIMI_CODING_MODEL_REF,
@@ -63,6 +66,7 @@ import {
   setCloudflareAiGatewayConfig,
   setQianfanApiKey,
   setGeminiApiKey,
+  setKilocodeApiKey,
   setLitellmApiKey,
   setKimiCodingApiKey,
   setMistralApiKey,
@@ -97,6 +101,7 @@ const API_KEY_TOKEN_PROVIDER_AUTH_CHOICE: Record<string, AuthChoice> = {
   huggingface: "huggingface-api-key",
   mistral: "mistral-api-key",
   opencode: "opencode-zen",
+  kilocode: "kilocode-api-key",
   qianfan: "qianfan-api-key",
 };
 
@@ -277,6 +282,18 @@ const SIMPLE_API_KEY_PROVIDER_FLOWS: Partial<Record<AuthChoice, SimpleApiKeyProv
     ].join("\n"),
     noteTitle: "QIANFAN",
   },
+  "kilocode-api-key": {
+    provider: "kilocode",
+    profileId: "kilocode:default",
+    expectedProviders: ["kilocode"],
+    envLabel: "KILOCODE_API_KEY",
+    promptMessage: "Enter Kilo Gateway API key",
+    setCredential: setKilocodeApiKey,
+    defaultModel: KILOCODE_DEFAULT_MODEL_REF,
+    applyDefaultConfig: applyKilocodeConfig,
+    applyProviderConfig: applyKilocodeProviderConfig,
+    noteDefault: KILOCODE_DEFAULT_MODEL_REF,
+  },
   "synthetic-api-key": {
     provider: "synthetic",
     profileId: "synthetic:default",