fix: route providers through correct APIs

[houko]

Summary

Set correct API endpoints for providers that were using empty base_url.

Providers with verified public APIs:

• aion-labs → api.aionlabs.ai/v1
• eleutherai → api.krater.ai/v1
• ibm-granite → us-south.ml.cloud.ibm.com/ml/v1 (watsonx)
• meta-llama → api.llama.com/v1
• microsoft → models.inference.ai.azure.com (GitHub Models)
• morph → api.morphllm.com/v1
• tencent → api.hunyuan.cloud.tencent.com/v1
• xiaomi → cnbj3-cloud-ml.api.xiaomi.net

13 remaining providers without known public APIs route through OpenRouter.

Also updates sync-pricing.py PROVIDER_API mapping.

Test plan

• Verify each provider's test endpoint responds (401/200 expected)
• python scripts/sync-pricing.py --dry-run --create-missing generates correct configs

[chatgpt-codex-connector]

💡 Codex Review

librefang-registry/providers/allenai.toml

Lines 7 to 11 in e9284da

	base_url = "https://openrouter.ai/api/v1"
	key_required = true
	[[models]]
	id = "olmo-2-0325-32b-instruct"

Restore provider prefixes in OpenRouter-backed model IDs

This file now routes requests to OpenRouter (base_url = "https://openrouter.ai/api/v1"), but the model IDs remain unprefixed (for example olmo-2-0325-32b-instruct instead of allenai/olmo-2-0325-32b-instruct). OpenRouter model routing requires provider-prefixed IDs, so these requests will resolve to model-not-found at runtime; the same regression pattern appears across the other provider TOMLs switched to OpenRouter in this commit.

---

librefang-registry/scripts/sync-pricing.py

Lines 157 to 159 in e9284da

	# No known public API — route through OpenRouter
	base_url = "https://openrouter.ai/api/v1"
	env_key = "OPENROUTER_API_KEY"

Keep OpenRouter model IDs intact when generating providers

The fallback path now routes unknown providers through OpenRouter, but generate_provider_toml still strips provider prefixes from OpenRouter IDs (split("/")[-1] later in the same function). That means newly generated provider files will contain bare model IDs while using an OpenRouter base URL, producing invalid configs that cannot address the intended models without manual correction.

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