fix: crash guards for LLM endpoint URL + ASR model loading

[H-Chris233]

User description

修复两个用户侧崩溃场景，详见 H-Chris233#2

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PR Type

Bug fix

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Description

• Validate ASR model files before FFI call to prevent segfaults

• Guard LLM provider construction with catch_unwind to avoid panics

• Auto-prepend http:// to endpoint URLs missing scheme

• Replace expect() with safe retry fallback in polish module

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Diagram Walkthrough

flowchart LR
  A["ASR: Validate model files"] --> B["Prevents segfault"]
  C["LLM: catch_unwind around provider"] --> D["Prevents process kill"]
  E["Endpoint: auto-prepend http://"] --> F["Fixes TLS handshake failure"]
  G["Polish: safe try_clone fallback"] --> H["Prevents panic on non-clonable body"]

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File Walkthrough

Relevant files

Bug fix

test_run.rs Add ASR model file validation before C FFI call                    openless-all/app/src-tauri/src/asr/local/test_run.rs Added integrity checks for required model files (config.json, vocab.json, merges.txt) existence and non-empty. Validate that .safetensors files exist and are at least 1KB. Errors now returned before C FFI call to prevent segfaults. +37/-0    llm_pipeline.rs Wrap LLM provider creation with panic guard and fix URL scheme openless-all/app/src-tauri/src/coordinator/llm_pipeline.rs Wrapped all four calls to build_active_llm_provider with catch_unwind. Panics are caught, logged, and returned as error instead of killing process. Auto-prepend http:// to endpoint URL if scheme missing (e.g., user typed IP:port). +53/-7    polish.rs Replace expect() with safe retry fallback for non-clonable body openless-all/app/src-tauri/src/polish.rs Replaced try_clone().expect() with safe fallback: if body not clonable, send once without retry. +10/-3

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[github-actions]

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