Add Vercel and OpenRouter to zero-config planoai up defaults

Wires `vercel/*` and `openrouter/*` into the synthesized default config so
`planoai up` with no user config exposes both providers out of the box
(env-keyed via AI_GATEWAY_API_KEY / OPENROUTER_API_KEY, pass-through
otherwise). Registers both in SUPPORTED_PROVIDERS_WITHOUT_BASE_URL so
wildcard model entries validate without an explicit provider_interface.

cli/test/test_config_generator.py

@@ -253,6 +253,42 @@ llm_providers:
     base_url: "http://custom.com/api/v2"
     provider_interface: openai
 
+""",
+    },
+    {
+        "id": "vercel_is_supported_provider",
+        "expected_error": None,
+        "plano_config": """
+version: v0.4.0
+
+listeners:
+  - name: llm
+    type: model
+    port: 12000
+
+model_providers:
+  - model: vercel/*
+    base_url: https://ai-gateway.vercel.sh/v1
+    passthrough_auth: true
+
+""",
+    },
+    {
+        "id": "openrouter_is_supported_provider",
+        "expected_error": None,
+        "plano_config": """
+version: v0.4.0
+
+listeners:
+  - name: llm
+    type: model
+    port: 12000
+
+model_providers:
+  - model: openrouter/*
+    base_url: https://openrouter.ai/api/v1
+    passthrough_auth: true
+
 """,
     },
     {