feat: add websocket event stream support with sse fallback

[sabbirba]

Summary

• Adds primary WebSocket streaming via /printer/ws using tungstenite with native TLS.
• Preserves 100% of existing handle(job), claim_job(), and is_online() logic.
• Maintains automatic fallback to HTTP SSE streaming if WebSocket connection fails.
• Fixes clippy lint in create_lpr_sock.

Verification

• cargo fmt --check passed.
• cargo clippy --all-targets --all-features -- -D warnings passed (0 warnings).
• cargo test passed.
• cargo build --release succeeded.

[Copilot]

🟡 Changes recommended

The WebSocket URL/Host header construction in stream() can generate incorrect endpoints and invalid/mismatched Host headers (notably when BASE_URL includes a path prefix or explicit port).

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds an event-streaming upgrade path to prefer WebSocket delivery for printer jobs, while retaining the existing HTTP SSE stream as a fallback.

Changes:

• Introduces a WebSocket-based stream in stream() that reads Job messages and dispatches them to the existing handle(job) logic.
• Keeps the existing SSE /printer stream path as the fallback when WebSocket connect fails.
• Adds tungstenite (rustls + native roots) and applies a small clippy-driven cleanup in create_lpr_sock.

File summaries

File	Description
src/socket.rs	Minor control-flow cleanup in socket creation error return.
src/main.rs	Adds WebSocket streaming path ahead of the existing SSE stream logic.
Cargo.toml	Adds tungstenite dependency with rustls TLS configuration.
Cargo.lock	Locks new transitive dependencies introduced by tungstenite.

Review details

• Files reviewed: 3/4 changed files
• Comments generated: 1
• Review effort level: Lite

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