dev: reorg codebase structure

[enitrat]

• - Major Python restructure: moved ad-hoc python/src/scripts/* into a proper package python/src/cairo_coder_tools/ with subpackages: datasets, evals.starklings, and ingestion

• New ingestion utilities: web_targets.py, improved summarizer modules, and generated docs (e.g., ingestion/generated/starknet-blog.md).
• New/updated CLIs: added python/src/scripts/ingest.py; consolidated datasets/cli.py → scripts/dataset.py; starklings_evaluate.py → scripts/eval.py.
• Removed obsolete items: scripts/README_starklings_evaluation.md, filter_2025_blogs.py, and old generated blog summary.
• Packaging updates: python/pyproject.toml adjusted to include cairo_coder_tools modules.
• TS ingesters refined: CairoBookIngester, CoreLibDocsIngester, StarknetBlogIngester updated; ingester.dockerfile touched.
• Repo config tweaks: .gitignore and .trunk/trunk.yaml updated.