Override ozon-analyzer prompts with user-defined custom prompts from localStorage

[cto-new]

Summary

• Enable user-defined prompts override for Ozon Analyzer by reading plugin-ozon-analyzer-settings from chrome.storage.local and applying them to manifest-based prompts.

Details

• Load custom prompts for basic_analysis and deep_analysis from local storage for both ru and en, and override non-empty custom_prompt values.
• Ensure top-level data structures for Pyodide (basic_analysis and deep_analysis) are populated with the resulting prompts to preserve expected runtime behavior.
• Preserve backward compatibility: manifest defaults are used when custom prompts are missing or empty.
• Introduce extensive LLM_PROMPT_DEBUG logging to trace prompt loading, overriding, and final prompt formation, including summaries of overrides and data snapshots before sending to the LLM engine.
• Add instrumentation for safe fallback and error handling to avoid breaking prompt delivery when storage access fails.

Impact

• No breaking changes; user prompts augment the flow when provided while maintaining manifest defaults as a fallback.

Testing

• Validate with cases where custom_prompt exists (ru/en), is empty, or is missing; verify AI receives the expected prompts.
• Confirm that the enhanced logs provide clear traces of the prompt override process.

Documentation

• Aligns with updates to FIX_IMPLEMENTATION.md, INVESTIGATION_REPORT.md, SOLUTION_SUMMARY.md, and CUSTOM_PROMPT_FIX_README.md.

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