[BOT ISSUE] Add perplexity/deepseek-v4-flash-0731 and perplexity/glm-5.2 to model catalog (Perplexity Agent API)

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Summary

Two models available on the Perplexity Agent API are missing from the model catalog. The underlying models exist in the catalog under different IDs on other providers (deepseek-ai/DeepSeek-V4-Flash-0731 on baseten/together, zai-org/GLM-5.2 on baseten/together), but the perplexity/-prefixed Agent API IDs are not present.

Source verification

Field	Value	Source
Model ID	perplexity/deepseek-v4-flash-0731	Perplexity Agent API Models
Input cost	$0.13 / 1M tokens	Perplexity Agent API Models
Output cost	$0.26 / 1M tokens	Perplexity Agent API Models
Cached input cost	$0.028 / 1M tokens	Perplexity Agent API Models
Model ID	perplexity/glm-5.2	Perplexity Agent API Models
Input cost	$1.40 / 1M tokens	Perplexity Agent API Models
Output cost	$4.40 / 1M tokens	Perplexity Agent API Models
Cached input cost	$0.26 / 1M tokens	Perplexity Agent API Models

Cross-source verification

• Both model IDs confirmed on Perplexity Agent API Models page with pricing
• Underlying deepseek-ai/DeepSeek-V4-Flash-0731 exists in catalog at line 10560 with available_providers: ["baseten", "together"]
• Underlying zai-org/GLM-5.2 exists in catalog at line 10583 with available_providers: ["baseten", "together"]
• Not present in model_list.json (grep confirmed zero matches for perplexity/deepseek-v4 and perplexity/glm)
• No existing open GitHub issue covers these Perplexity Agent API model IDs

Notes

• Perplexity Agent API pricing "reflects direct first-party provider pricing with no markup" per their docs
• The perplexity/ prefix convention matches the existing perplexity/sonar-pro-search entry pattern
• These entries need available_providers: ["perplexity"] since they are accessed via the Perplexity endpoint

[github-actions]

Autofix skipped because the issue body/title did not contain parseable bot metadata for a model catalog change.