chore: replace structopt with clap v4

[synchwire]

Replaces the deprecated structopt crate with clap v4 (derive feature). CLI behaviour is identical — only the parsing layer has changed.

Changes

• Cargo.toml: swap structopt for clap = { version = "4", features = ["derive"] }
• All #[derive(StructOpt)] → #[derive(Parser)]
• All #[structopt(...)] attributes → #[arg(...)] / #[command(...)] equivalents
• StructOpt::from_args() → .parse()
• Verified with cargo check

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[cocogitto-bot]

❌ Found 1 compliant commit and 3 non-compliant commits in fa7df10...12a8bb5.

Commit 3470296 by @ThetaSinner is not conform to the conventional commit specification :

• message: fixup! chore: replace structopt with clap v4
• cause:

  Missing commit type separator `:`
  
  Caused by:
       --> 1:7
        |
      1 | fixup! chore: replace structopt with clap v4
        |       ^---
        |
        = expected type_separator
  

Commit 0c5efa9 by @ThetaSinner is not conform to the conventional commit specification :

• message: fixup! chore: replace structopt with clap v4
• cause:

  Missing commit type separator `:`
  
  Caused by:
       --> 1:7
        |
      1 | fixup! chore: replace structopt with clap v4
        |       ^---
        |
        = expected type_separator
  

Commit 12a8bb5 by @ThetaSinner is not conform to the conventional commit specification :

• message: fixup! fixup! chore: replace structopt with clap v4
• cause:

  Missing commit type separator `:`
  
  Caused by:
       --> 1:7
        |
      1 | fixup! fixup! chore: replace structopt with clap v4
        |       ^---
        |
        = expected type_separator