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[xiaozhou26]

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Pull request overview

This PR introduces randomized User-Agent generation and a refactored/optimized proof-of-work (Sentinel) token generator, and threads the UA through more of the ChatGPT request flow. It also updates SSE/TTS stream parsing and adjusts response conversion/model propagation tests.

Changes:

• Add util.RandomUserAgent() (+ tests) and use it across ChatGPT requests instead of a single hardcoded UA.
• Rewrite internal/prooftoken to generate requirements/proof tokens with new config structures and iteration logic.
• Improve stream handling (notably TTS patch-stream parsing) and ensure the request model is propagated into converted SSE chunks.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
util/useragent.go	Adds randomized Edge-family UA generator.
util/useragent_test.go	Adds tests for UA generation behavior.
internal/prooftoken/prooftoken.go	Refactors POW requirements/proof token generation and related utilities.
internal/chatgpt/request.go	Uses randomized UA, updates sentinel init flow, and improves TTS SSE parsing.
internal/chatgpt/request_test.go	Updates tests for UA expectations and adds TTS stream parsing coverage.
internal/chatgpt/files.go	Switches upload UA to defaultUserAgent().
internal/chatgpt/client_state.go	Adds UserAgent to client state and initializes it.
internal/chatgpt/artifact_delivery.go	Switches download UA to defaultUserAgent().
initialize/handlers.go	Updates TTS handler flow to use the newer conversation-posting path and closes WS on error.
conversion/response/chatgpt/convert.go	Makes chunk conversion safer when content parts are missing/non-string and uses request model.
conversion/response/chatgpt/convert_test.go	Adds tests for model propagation and source-marker handling.
go.mod	Removes funcaptcha dependency.
go.sum	Removes funcaptcha checksums.
.gitignore	Normalizes .gocache entry and adds additional ignores.

Comments suppressed due to low confidence (1)

util/useragent.go:49

• RandomUserAgent uses a shared *rand.Rand (uaRand) without synchronization, but math/rand.Rand is not safe for concurrent use. If RandomUserAgent is called from multiple goroutines this can cause data races and undefined behavior.

// RandomUserAgent 返回一个随机的主流桌面浏览器 User-Agent
func RandomUserAgent() string {
	initUARand()
	spec := userAgentSpecs[uaRand.Intn(len(userAgentSpecs))]

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