Fix four bugs and add logo/branding polish

- docker-compose: add register-user service (profiles: [tools]) with YAML anchor to avoid env duplication
- src/index.ts: show localhost instead of 0.0.0.0 in startup message
- file-view: render <img> inline for image/* MIME types
- file-list: add Copy link button per row (requires baseUrl param)
- layout: add hideLogo option; file view page hides the logo
- style.css: remove uppercase from .logo (Nanodrop not NANODROP), add button.copy-link styles, add .file-view img styles, widen last td

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/pages.ts

@@ -100,7 +100,7 @@ export const pageRoutes: FastifyPluginAsync<{ deps: Deps }> = async (app, { deps
   app.get('/files', { preHandler: requireAuth }, async (request, reply) => {
     const { sub: userId } = request.user as JwtPayload;
     const files = getFilesByUserId(db, userId);
-    reply.type('text/html').send(fileListPage(files));
+    reply.type('text/html').send(fileListPage(files, config.baseUrl));
   });
 
   // POST /files/:id/delete