docs: sync in-repo documentation from the project Wiki (DeepWiki)

[devin-ai-integration]

Summary

Brings the project's documentation into the repo. The repo previously had no in-repo developer docs beyond README.md/CLAUDE.md, and the only existing "wiki" for this app is its DeepWiki. This PR imports that full wiki (30 pages) into a new docs/ folder so the documentation lives alongside the code and is browsable on GitHub.

Note: this repo has no GitHub Wiki enabled, and there is no matching page in the cog-gtm Confluence or Notion — so "the Wiki" here is the DeepWiki. Happy to re-point at a different source if intended.

What's added

• docs/README.md — index with the full table of contents (linked from the main README.md).
• 32 page files mirroring the wiki hierarchy:
  • Overview, Getting Started
  • Architecture (bootstrap/config, HTTP pipeline, auth, routing)
  • Core Services (UserService, interceptors, JwtService, domain services)
  • Feature Modules (articles + list/detail/editor, profiles, settings/auth UI, home/feed)
  • Shared Components & Directives (layout, favorite/follow buttons, conditional rendering/errors)
  • Testing Strategy (Vitest unit, Playwright E2E, error-handling/feature tests)
  • Build & Deployment (build config, CI/CD, dependencies)

Link handling during import

The raw wiki uses anchor links and source-reference links that don't resolve as in-repo files. These were rewritten so everything is browsable from docs/:

[Architecture](#3)                  -> [Architecture](3-architecture.md)
[src/app/app.config.ts]()           -> `src/app/app.config.ts`   (empty-target source refs -> inline code)
[README.md](README.md)              -> [README.md](../README.md) (repo-root paths get ../ since docs live in docs/)

Mermaid diagrams and tables from the wiki are preserved.

Validation

• All intra-doc and ../-relative source links resolve (checked: 0 missing).
• bun run format:check passes; the husky pre-commit lint-staged (prettier) ran clean on the added files.

The README.md change adds a short "Documentation" section pointing at docs/README.md.

Link to Devin session: https://app.devin.ai/sessions/b5266837d55e4415889bc076351ee2e9

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