feat(cli): ProjectDiscovery-style UX — banner, colored logs, braille spinner, styled tables

[Copilot]

Brings macaron's CLI UX to parity with ProjectDiscovery tooling (nuclei, httpx, subfinder) — banner on startup, colored log levels, live braille spinner, and colored result tables.

internal/cliui/banner.go (new)

• Box-drawing MACARON art + tagline/version header via PrintBanner(version, quiet)
• Colored log helpers: Info (cyan [INF]), Warn (yellow [WRN]), Err (red [ERR]), OK (green [OK])
• Color utility functions (Highlight, Muted, GreenText, RedText, YellowText, CyanText)
• Respects NO_COLOR env var and new -nc flag

internal/cliui/live.go

• Swapped |/-\ spinner for braille frames (⣾⣽⣻⣷⣯⣟⡿⢿) — same pattern as Nuclei/httpx
• Live line format: ⣾ example.com [subdomains] enumerating (4s)
• Stage events logged as [SCAN], [RUN], [OK], [WRN] badges

cmd/macaron/main.go

• Banner shown for all user-facing commands; suppressed by -qut
• printHelp() rewritten — grouped sections (USAGE / SCAN FLAGS / OUTPUT FLAGS / API KEYS / DASHBOARD / TOOLS & CONFIG / EXAMPLES), cyan flag names, muted descriptions
• Pre-scan: [INF] Profile: balanced | mode: wide | stages: all | rate: 150 | threads: 30
• Post-scan: [OK] Completed 1 target(s) in 12.4s
• -lst shows ✔ installed / ✘ missing per tool
• All fmt.Fprintf(os.Stderr, ...) replaced with typed log helpers

internal/app/app.go

• All tables use table.StyleRounded + cyan column headers
• Vuln counts colored red when >0; live-host counts colored green when >0
• Extracted tableStyle() helper for consistency across ShowStatus, RenderSetup, RenderScanSummary