OpenRouter: allow any model ID instead of restricting to static catalog (#14312)

* OpenRouter: allow any model ID instead of restricting to static catalog

OpenRouter models were restricted to a hardcoded prefix list in the internal model catalog, preventing use of newly added or less common models. This change makes OpenRouter work as the pass-through proxy it is -- any valid OpenRouter model ID now resolves dynamically.

Fixes https://github.com/openclaw/openclaw/issues/5241

Changes:
- Add OpenRouter as an implicit provider in resolveImplicitProviders so models.json is populated when an API key is detected (models-config.providers.ts)
- Add a pass-through fallback in resolveModel that creates OpenRouter models on-the-fly when they aren't pre-registered in the local catalog (
model.ts
)
- Remove the static prefix filter for OpenRouter/opencode in isModernModelRef (live-model-filter.ts)

* Apply requested change for maxTokens

* Agents: remove dead helper in live model filter

* Changelog: note Joly0/main OpenRouter fix

* Changelog: fix OpenRouter entry text

---------

Co-authored-by: Vincent Koc <vincentkoc@ieee.org>

src/agents/pi-embedded-runner/model.ts

@@ -80,6 +80,24 @@ export function resolveModel(
     if (forwardCompat) {
       return { model: forwardCompat, authStorage, modelRegistry };
     }
+    // OpenRouter is a pass-through proxy — any model ID available on OpenRouter
+    // should work without being pre-registered in the local catalog.
+    if (normalizedProvider === "openrouter") {
+      const fallbackModel: Model<Api> = normalizeModelCompat({
+        id: modelId,
+        name: modelId,
+        api: "openai-completions",
+        provider,
+        baseUrl: "https://openrouter.ai/api/v1",
+        reasoning: false,
+        input: ["text"],
+        cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+        contextWindow: DEFAULT_CONTEXT_TOKENS,
+        // Align with OPENROUTER_DEFAULT_MAX_TOKENS in models-config.providers.ts
+        maxTokens: 8192,
+      } as Model<Api>);
+      return { model: fallbackModel, authStorage, modelRegistry };
+    }
     const providerCfg = providers[provider];
     if (providerCfg || modelId.startsWith("mock-")) {
       const fallbackModel: Model<Api> = normalizeModelCompat({