chore: prepare release v0.3.0

CONTRIBUTING.md

@@ -142,21 +142,24 @@ volumen/
 │   └── volumen/
 │       ├── version.rb
 │       ├── frontmatter.rb # parse/serialise the +++ TOML frontmatter block
-│       ├── markdown.rb    # kramdown (GFM) → HTML
+│       ├── markdown.rb    # kramdown (GFM) → HTML; <figure> for titled images
 │       ├── post.rb        # Post model (metadata + body + rendered HTML)
-│       ├── store.rb       # read/write posts and media on disk
+│       ├── store.rb       # read/write posts and media on disk (mtime-cached)
 │       ├── config.rb      # load/merge config.toml, generate template
 │       ├── password.rb    # scrypt hashing/verification (OpenSSL::KDF)
-│       ├── users.rb       # users.toml, admin/author roles
-│       ├── server.rb      # Sinatra app: public API + admin
+│       ├── users.rb       # users.toml, admin/author roles, per-user profile
+│       ├── feed_helpers.rb # RSS / JSON Feed / sitemap generation
+│       ├── api_routes.rb  # /api/volumen/* (Sinatra routes)
+│       ├── admin_routes.rb # /admin/* (Sinatra routes)
+│       ├── server.rb      # Sinatra app: composes the two route modules
 │       ├── cli.rb         # command dispatcher
 │       └── web/
 │           ├── views/     # ERB templates (layout, login, list, form, settings)
-│           └── public/    # static assets (volumen-logo.svg)
+│           └── public/    # static assets (volumen-logo.svg, volumen-icon.svg)
 ├── test/                  # minitest suite
 ├── docs/                  # architecture, configuration, api-reference, deployment, security
 ├── .forgejo/workflows/    # test.yml, release.yml (Forgejo Actions)
-├── justfile               # install, run, dev, build, test, uninstall
+├── justfile               # install, run, dev, lint, fmt, build, test, uninstall
 ├── volumen.gemspec
 ├── Gemfile
 ├── CHANGELOG.md