feat(providers): streamline tokenrouter models and add missing provider icons

- Prune tokenrouter seed models from 121 to 22 flagship/newest models
- Add z-ai/glm-5.3-free with 0 pricing
- Add missing 128x128 icons for alims-intl, alitp-intl, fish-audio, and selfhosted-* providers

Co-Authored-By: Claude Code <noreply@anthropic.com>

open-sse/providers/pricing.js

@@ -264,6 +264,7 @@ export const PROVIDER_PRICING = {
     "z-ai/glm-5-turbo": { input: 1.2, output: 4.0, cached: 0.24, reasoning: 4.0 },
     "z-ai/glm-5.1": { input: 1.05, output: 3.5, cached: 0.525, reasoning: 3.5 },
     "z-ai/glm-5.2": { input: 1.4, output: 4.4, cached: 0.26, reasoning: 4.4 },
+    "z-ai/glm-5.3-free": { input: 0, output: 0, cached: 0, reasoning: 0 },
   },
 };