refactor(pm-cli): consolidate package manager infrastructure

[forehalo]

Summary

This refactor makes typed command arguments the source of truth for package-manager compatibility.

#[pm_args] reads field-level not_supported(...) metadata, including manager and version conditions

before:

#[derive(clap::Args)]
struct InstallArgs {
    #[arg(long)]
    fix_lockfile: bool,
}

// Simulated
match command {
  Command::Install(args) => {
    match manager {
      Yarn => {
        if args.fix_lockfile {
          output::warn("yarn@1 install does not support --fix-lockfile");
        }
        // ...
      },
      Npm => {
        if args.fix_lockfile {
          output::warn("npm install does not support --fix-lockfile");
        }
        // ...
      },
      Bun => {
        if args.fix_lockfile {
          output::warn("bun install does not support --fix-lockfile");
        }
        // ...
      }
    }
  },
  // ...
}

after:

#[pm_args]
#[derive(clap::Args)]
struct InstallArgs {
    #[arg(long, not_supported(npm, bun, yarn < "2"))]
    fix_lockfile: bool,
}

Given the detected package manager and its version, the generated diagnosis step automatically:

• identifies active arguments that are unsupported;
• resets only those arguments to their default value;
• records a consistent warning before command resolution.

This removes repeated compatibility checks from every npm, pnpm, Yarn, and Bun resolver. Normal clap::Args and clap::Subcommand derives remain explicit. Hard errors, fallback commands, and manager-specific translations stay in the resolver.

Architecture and benefits

The production path is now:

typed clap arguments -> #[pm_args] diagnosis -> manager-specific Resolve<Args> -> Resolution -> runner

• Global and local CLIs share one typed PackageManagerCommand surface.
• Parsing, compatibility diagnosis, and production dispatch use the same argument types.
• Resolution is side-effect free and directly testable. The runner executes the completed plan afterward.
• Package-manager detection, downloads, caching, HTTP access, and shims now live in vite_pm_cli; the redundant vite_install crate is removed.

Adding a command

1. Define an XxxArgs clap struct, or an XxxCommand nested subcommand enum, and add #[pm_args].
2. Declare cross-manager and cross-version compatibility with field-level not_supported(...) rules.
3. Implement Resolve<Args> for npm, pnpm, Yarn, and Bun. Build argv with CommandBuilder; share lowering helpers where command shapes match and branch only where manager behavior differs.
4. Register the type in PackageManagerCommand or PmCommand, then select its project/manager policy.
5. Test parsing and resolution with the shared test helpers. Add PTY snapshots for user-visible behavior.

Validation

• just check
• cargo test -p vite_pm_cli — 701 passed, 2 ignored
• Affected-crate tests and strict Clippy with -D warnings
• cargo fmt --all -- --check and git diff --check
• Focused PTY snapshots for version, dedupe, install options, managed package-manager paths, shims, and CLI help

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