Support proxy

[utensil]

Fixes #43

hackernews-TUI uses ureq 2.10.0 as its HTTP client library, it supports proxies via features proxy-from-env to load proxy settings from environment variable, and socks-proxy to support socks proxies.

ureq has 3.x and feature proxy-from-env is enabled by default there, but I didn't bump it to 3.x to avoid compatibility issues, only adding these 2 features.

Locally I've tested them to work very well with http and sock5 proxies.

For users really need things to work right now before this PR is merged, you may just

cargo install --git https://github.com/utensil/hackernews-TUI --branch proxy hackernews_tui --locked

So you are good to go!

[Copilot]

Pull Request Overview

Adds support for HTTP and SOCKS proxies by enabling the corresponding features in the HTTP client dependency.

• Enables proxy-from-env and socks-proxy features on the ureq dependency
• Keeps version at 2.10.0 to avoid breaking changes

Comments suppressed due to low confidence (2)

hackernews_tui/Cargo.toml:40

• Consider updating the README or other user-facing docs to explain how to configure and use the new proxy support (e.g., setting environment variables or SOCKS proxy URIs).

ureq = { version = "2.10.0", features = ["json", "cookies", "proxy-from-env", "socks-proxy"] }

hackernews_tui/Cargo.toml:40

• Add integration tests or mock-based tests to verify that proxy settings from environment variables and SOCKS proxies are correctly applied in HTTP requests.

ureq = { version = "2.10.0", features = ["json", "cookies", "proxy-from-env", "socks-proxy"] }