Fix Windows Cookbook background tasks, exit statuses, and empty SSH logs wrapper (#1389)

This commit consolidates all Windows Cookbook background fixes into a single comprehensive commit based on the latest main branch.

Key fixes included:
1. React looksSuccessful Mismatch: Append 'DOWNLOAD_OK' for pip install commands in routes/cookbook_routes.py.
2. Local Windows SSH Wrapper & Log Directory Mismatch: Bypassed ssh wrappers and dynamically selected odysseus-tmux logs for local tasks in static/js/cookbookRunning.js.
3. WSL Bash Filtration: Filtered out the WSL bash stub at C:\Windows\System32\bash.exe in core/platform_compat.py.
4. Drive-Colon Path Normalization: Replaced .as_posix() with git_bash_path() in routes/shell_routes.py and src/bg_jobs.py.
5. GGUF-Only Hardware Fitting: Restructured local Windows recommendations to rank GGUF only in services/hwfit/fit.py.
6. Safe Win32 Process Liveness Probe: Replaced os.kill(pid, 0) with a safe Win32 API probe using GetExitCodeProcess in core/platform_compat.py.
7. Prebuilt llama-cpp-python Wheels: Supply the CPU extra index during compilation failure fallback.
8. Enforce UTF-8 log encoding: Set PYTHONIOENCODING=utf-8 on Windows bootstrap runners.
9. Fix Linux Llama.cpp Build script syntax error in routes/cookbook_helpers.py.
10. Page Reload Status Check: Run sys.executable instead of 'python3' to bypass Microsoft Store execution stubs on local Windows hosts.
11. Llama.cpp serve build bypass: Bypassed cmake compilation checks on local Windows and verified python bindings directly.
12. Serve Command Path Validation: Masked safe GGUF path printf subshells '' inside the serve command validator.
13. CPU Mismatch Diagnostics: Intercepted AVX2-lacking '0xc000001d' (Illegal Instruction) crashes in static/js/cookbook-diagnosis.js and guided users to Ollama.
14. Windows Pytest stability: Fixed stub import leakage in test files.

static/js/cookbook-diagnosis.js

@@ -426,6 +426,15 @@ export const ERROR_PATTERNS = [
       { label: 'Copy install command', action: () => _copyText('pip install "llama-cpp-python[server]"') },
     ],
   },
+  {
+    pattern: /Windows Error 0xc000001d|Illegal instruction|0xc000001d/i,
+    message: 'AVX2 Instruction Set Mismatch: the precompiled llama-cpp-python wheel requires CPU features (AVX2/FMA) that your processor or virtual machine lacks.',
+    suggestion: 'Suggested action: switch this serve config to Ollama (highly recommended, has dynamic CPU fallbacks), or choose a remote Linux GPU server.',
+    fixes: [
+      { label: 'Switch to Ollama', action: (panel) => _openServeEditFromDiagnosis(panel, { backend: 'ollama' }) },
+      { label: 'Choose remote server', action: (panel) => _openServeEditFromDiagnosis(panel) },
+    ],
+  },
   {
     pattern: /CUDA Toolkit not found|Unable to find cudart library|missing:\s*CUDA_CUDART/i,
     message: 'llama.cpp found nvcc, but the CUDA runtime library is missing.',