Implement Durham City OnBase scraper

[ThatXliner]

Closes #166.

What changed

• Adds a current-cycle Durham City Council scraper using official OnBase Agenda Online endpoints.
• Persists meetings, work sessions, agenda/minutes items, attachments, action text, and votes.
• Adds provider-neutral local meeting/item storage, migration, readers, and tRPC routes.
• Adds deterministic fixtures, caching, request pacing, retries, and documentation.

Validation

• 16 scraper tests, 5 API tests, and 7 environment tests.
• Scraper, API, DB, and environment typechecks.
• API lint and diff checks.
• Live check: 25 meetings; meeting 748 parsed 23 items, 22 with action/vote text.

Notes

A real migration/scrape was not run without a disposable Postgres target. Provider-neutral local-government schema files overlap with #167 and #170.

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Project	Deployment	Actions	Updated (UTC)
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[ThatXliner]

Superseded by consolidated PR #181, which combines the North Carolina and Texas current-cycle scrapers and resolves the shared local-government schema/API overlap.