feat: redesign admin panel & profile page, optimize Dockerfile, remove rootless

- Completely redesign admin.html matching OxiCloud design system
- Create standalone profile.html page with avatar, details & password change
- Optimize Dockerfile: 3-stage build, non-root user, OCI labels, layer cache
- Add .dockerignore to reduce build context
- Remove redundant Dockerfile.rootless & rootless-compose.yml
- Redesign login language selector as compact dropdown with search
- Fix CI/CD workflows (ci.yml, docker-build.yml, docker-publish.yml)
- Update app.js to navigate to profile page instead of modal

Cargo.toml

@@ -10,7 +10,7 @@ tokio = { version = "1.49.0", features = ["full"] }
 tokio-util = { version = "0.7.18", features = ["io", "codec"] }
 tokio-stream = { version = "0.1.18", features = ["fs"] }
 bytes = "1.11.0"
-tempfile = "3.24.0"
+tempfile = "3.25.0"
 tower = "0.5.3"
 tower-http = { version = "0.6.8", features = ["fs", "compression-gzip", "trace", "cors", "add-extension", "request-id"] }
 flate2 = "1.1.9"
@@ -32,7 +32,7 @@ sqlx = { version = "0.8.6", features = ["postgres", "runtime-tokio", "tls-rustls
 anyhow = "1.0.101"
 jsonwebtoken = { version = "10.1.0", features = ["rust_crypto"] }
 argon2 = "0.5.3"
-rand_core = { version = "0.6.4", features = ["std"] }
+rand_core = { version = "0.9.5", features = ["std"] }
 hyper = { version = "1.8.1", features = ["full"] }
 quick-xml = "0.39.0"
 dotenv = "0.15.0"