Add w3ds file URI docs to the docs site

[coodos]

What

Moves the w3ds://file URI scheme documentation into the Docusaurus docs site, where it belongs alongside the other protocol docs.

Changes

• Adds docs/docs/W3DS Protocol/File-URIs.md: the full w3ds://file scheme spec (format, storage flow, HTTP and programmatic dereferencing, error handling), with Docusaurus frontmatter and cross-links.
• Updates docs/docs/Post Platform Guide/mapping-rules.md: adds a File Referencing (__file) section next to __date and __calc.
• Updates docs/docs/Infrastructure/Web3-Adapter.md: lists __file among the mapping directives and links to the new protocol page.
• Deletes infrastructure/web3-adapter/W3DS_URI.md: this was a misplaced copy. The canonical doc now lives in the docs site.
• Repoints the link in infrastructure/web3-adapter/MAPPING_RULES.md to the docs site page.

Notes

Docs only. No code changes. Split out from the already merged w3ds file URI PR (#965) to avoid conflicts.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 407ef4e3-45d0-44bc-80fb-f0e35c9efe3b

📥 Commits

Reviewing files that changed from the base of the PR and between 0c93740 and 5968647.

📒 Files selected for processing (5)

• docs/docs/Infrastructure/Web3-Adapter.md
• docs/docs/Post Platform Guide/mapping-rules.md
• docs/docs/W3DS Protocol/File-URIs.md
• infrastructure/web3-adapter/MAPPING_RULES.md
• infrastructure/web3-adapter/W3DS_URI.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/w3ds-file-uri

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