feat: add delta application refresh

[CryptoJones]

Summary

• maintain a cheap tenant-scoped application-list revision from every database writer
• add private ETag and If-None-Match support to GET /api/apps while preserving the original bare-array response for existing clients
• avoid fetching stats or rerendering the SPA pipeline/sidebar when the list is unchanged
• isolate validators across tenants and vary cached responses by session cookie
• bump both runtime versions and the production image pin example to 1.13.0

Validation

• 63 Python tests passed; Ruff, strict mypy, and Bandit clean
• 192 .NET tests passed, including migration, backward-compatibility, 304, mutation, cascade, and tenant-isolation coverage
• 14 Playwright tests passed; 2 expected skips, including unchanged-DOM ETag refresh coverage
• production compose validation passed
• npm, NuGet, and pip-audit report no known vulnerabilities
• uv lock check clean

Closes #54

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 6992bd1 and 2b8fb2b.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (12)

• .env.production.example
• BACKLOG.md
• README.md
• api/ApplyTrack.Api.Tests/EndpointContractTests.cs
• api/ApplyTrack.Api/ApplyTrack.Api.csproj
• api/ApplyTrack.Api/Data/ApplicationRepo.cs
• api/ApplyTrack.Api/Endpoints/AppsEndpoints.cs
• api/ApplyTrack.Api/Migrations/0015_application_list_revision.sql
• api/ApplyTrack.Api/wwwroot/api-client.js
• api/ApplyTrack.Api/wwwroot/app.js
• pyproject.toml
• tests/web/accessibility.spec.js

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