feat: add vortix report bug report command

[Harry-kp]

Summary

• Adds a new vortix report CLI command that collects safe system diagnostics and helps users file GitHub issues with pre-filled environment info
• Auto-detects: version, install method (brew/cargo/source/binary), OS, terminal, shell, runtime dependencies (curl, wg, openvpn, etc.) with paths and versions, config state, kill switch state
• Privacy-by-design: never touches IPs, server endpoints, profile names, credentials, DNS servers, or log contents
• Three submission options: open browser with pre-filled issue URL, copy to clipboard, or print Markdown to stdout
• SSH-aware: hides browser option when running over SSH
• Redesigns the bug report issue template to match the auto-generated report sections
• 10 unit tests covering version parsing, URL construction, and body formatting

UX Flow

$ vortix report

Collecting system information...

Bug Report Preview
==================

  Vortix:       0.1.4 (cargo install)
  OS:           macOS 15.6 (Darwin 24.6.0) (aarch64)
  Terminal:     xterm-256color (120x40)
  Shell:        /bin/zsh
  Running as:   user

  Dependencies:
    curl         /usr/bin/curl (8.7.1)
    wg-quick     /opt/homebrew/bin/wg-quick
    wg           /opt/homebrew/bin/wg (1.0.20250521)
    openvpn      /opt/homebrew/sbin/openvpn (2.6.19)
    pfctl        /sbin/pfctl

  Config:
    Directory:   ~/.config/vortix (default)
    config.toml: not found (using defaults)
    Profiles:    6 (2 WireGuard, 4 OpenVPN)
    Kill switch: off

Describe the issue (press Enter on an empty line to finish):
> ...

  [o] Open in browser (pre-filled GitHub issue)
  [c] Copy to clipboard
  [p] Print report
  [q] Cancel

New Dependencies

• open = "5" -- cross-platform browser opening (used by starship, bat)
• urlencoding = "2" -- URL percent-encoding for GitHub issue body

Test plan

• cargo build -- clean
• cargo clippy -- no warnings
• cargo test cli::report -- 10/10 pass
• Smoke test: echo "q" | cargo run -- report -- preview renders correctly
• Smoke test: echo "p" | cargo run -- report -- Markdown output is well-formed
• Manual test: press o to verify browser opens with pre-filled issue
• Manual test: press c to verify clipboard works
• Test on Linux (iptables/nft detection, xclip fallback)

[Copilot]

Pull request overview

Adds a new vortix report CLI subcommand to generate a privacy-oriented bug report, preview it interactively, and help users submit it via browser/clipboard/stdout, alongside updating the GitHub bug issue template to match the generated sections.

Changes:

• Introduces vortix report command flow (data collection, preview, issue body formatting, submit options).
• Adds constants + dependencies for GitHub URL construction (open, urlencoding) and URL length limiting.
• Updates .github/ISSUE_TEMPLATE/bug_report.md to align with the auto-generated report sections.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/constants.rs	Adds GitHub repo URL + issue URL length limit constants used by the report command.
src/cli/report.rs	Implements diagnostics collection, report formatting, URL construction, clipboard/browser submission, and unit tests.
src/cli/mod.rs	Exposes the new report module.
src/cli/commands.rs	Wires the Report subcommand into CLI dispatch.
src/cli/args.rs	Adds the Report subcommand to the CLI enum.
Cargo.toml	Adds open and urlencoding dependencies for report submission.
Cargo.lock	Locks new transitive dependencies from open/urlencoding.
.github/ISSUE_TEMPLATE/bug_report.md	Restructures the bug report template to match the generated Markdown sections.

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