Add local prompt-based image search app, dedupe manager, and Windows launchers

[offmybach]

Motivation

• Provide a local, prompt-based image search application with an integrated duplicate-cleanup workflow and easier Windows-first installation.
• Remove dependency on creating virtual environments by installing dependencies into a local .deps folder and simplify common user errors (wrong Python, ComfyUI embedded Python).

Description

• Add image_prompt_search.py to index images and perform semantic prompt searches using sentence-transformers, and add streamlit_image_search_app.py to provide a local Streamlit UI.
• Add image_dedupe_manager.py to detect exact and visual duplicates (SHA-256 + pHash), quarantine removed files into an app-managed recycle bin with manifest logging, and provide restore/purge operations.
• Add Windows helper scripts setup_windows.bat, diagnose_windows.bat, run_image_search_windows.bat, and run_dedupe_windows.bat to detect Python, install deps into .deps, verify imports, and expose interactive/CLI launchers for indexing, searching, UI, scanning, restoring, and purging.
• Add requirements-image-search.txt and requirements-image-dedupe.txt and update README.md with installation, usage, troubleshooting, and notes about drive/path handling, scan_summary output, and no-venv setup.

Testing

• Ran automated import verification that loads PIL, numpy, sentence_transformers, streamlit, and imagehash via the setup check in setup_windows.bat which completed successfully.
• Ran automated compile checks via python -m py_compile image_prompt_search.py streamlit_image_search_app.py image_dedupe_manager.py (invoked by diagnose_windows.bat) which passed.

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Codex Task