feat(ui): dark theme redesign, fix image search and defaults

- Inline CSS in base.html (Inter, dark mode, sticky search, tabs, results)
- Remove HTMX/JS from templates; pagination via GET links
- Atmospheric side gradients + grid; wider column on large viewports
- Parse ?category= for HTML tabs (fixes Images category routing)
- Include bing_images, ddg_images, qwant_images in local_ported defaults
- Default listen port 5355; update Docker, compose, flake, README
- Favicon img uses /favicon/ proxy; preferences without inline JS

Made-with: Cursor

Dockerfile

@@ -21,7 +21,7 @@ RUN apk add --no-cache ca-certificates tzdata
 COPY --from=builder /kafka /usr/local/bin/kafka
 COPY config.example.toml /etc/kafka/config.example.toml
 
-EXPOSE 8080
+EXPOSE 5355
 
 ENTRYPOINT ["kafka"]
 CMD ["-config", "/etc/kafka/config.toml"]