[dest4590]

Resolves #780.

Two main things in this PR:

1. Port ranges in -p/--ports and --range coexistence

   • -p and --exclude-ports now accept ranges and mixed input like -p 80,443,8000-8080,9000.
   • Dropped conflicts_with = "ports" from --range. If both flags are passed, ports are merged and deduplicated in order.
   • Added unit tests for mixed range parsing and strategy picking.

2. Clean up color crates

   • Replaced scattered calls to colored and ansi_term with colorful (which was already in use across the repo).
   • Removed unmaintained ansi_term (and transitively winapi 0.3). Windows console ANSI mode is now enabled via windows-sys, which was already a dependency.
   • Dropped unused anstream and colored from Cargo.toml.
   • Swapped standalone serde_derive crate for standard serde features.

Tests pass (cargo test), clippy is clean.