perf(worker): shut down public previews and trim detail loads

[tiankaima]

Goal

Cut Worker CPU by removing the public preview ingress that bypasses the zone WAF, then trim unused work from catalog detail requests. In a fixed production two-hour baseline, stale version and branch aliases produced 95.82% of requests and 98.75% of Worker CPU; the active production version used only 1.25% of total CPU.

Changed Surfaces

• Disable public workers.dev, version, and alias preview URLs while retaining the production custom domain.
• Disable automatic invocation logs that retain raw request metadata; keep sampled custom logs and traces.
• Normalize every direct calendar-feed credential segment in API observability paths.
• Remove unused comment counts and latest-comment queries from course, teacher, and section detail loaders.
• Disable SvelteKit hover data preloads on detail tab navigation.
• Add direct loader, config, path-normalization, and browser regression coverage.

Evidence

• Production Workers Analytics baseline: 22,275 requests and 4,428.0 CPU seconds over two hours; stale preview aliases accounted for 4,372.5 CPU seconds.
• Canonical checks passed: Biome, Svelte check with 0 errors and 0 warnings, three TypeScript projects, and Vitest with 1,530 tests.
• Fresh isolated database verification passed: 49 migrations, seed, and integration suite with 239 passed and 13 skipped.
• Full Playwright suite passed: 750 passed, 1 skipped, 0 failed.
• Production build and Wrangler deploy dry run passed.

Docs / Contracts

README and observability documentation now describe disabled public preview routing and automatic invocation logs. Public REST, GraphQL, and MCP contracts are unchanged.

Risk Areas

• Online PR/version preview URLs intentionally become inaccessible; non-production builds still upload versions for build validation.
• The production custom domain and routes remain enabled.
• Automatic invocation logs become unavailable, but privacy-safe custom logs, traces, and Workers Analytics remain enabled.
• No Prisma schema, migration, authentication, API, or data-shape change.

Cleanup

The isolated test databases and ignored build/browser artifacts were removed. The worktree contains only the committed changes.

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	life-ustc	6794fd8	Commit Preview URL Branch Preview URL	Jul 25 2026, 10:23 PM

[github-actions]

E2E HTML report is ready: https://life-ustc.github.io/e2e-snapshot-artifacts/reports/30177447299/index.html
All reports: https://life-ustc.github.io/e2e-snapshot-artifacts/

[github-actions]

🎉 This PR is included in version 1.77.16 🎉

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