feat(pgpm): replace --include with --minio flag for docker command

[pyramation]

Summary

Replaces pgpm docker start --include minio with the simpler pgpm docker start --minio, matching the --minio flag pattern already used in pgpm env (PR #976).

• Removes parseInclude() and resolveIncludedServices() (which parsed --include <name> args and did name lookups with warnings for unknown services)
• Adds resolveServiceFlags() which checks CLI args directly against ADDITIONAL_SERVICES keys — if args.minio is truthy, the minio service is included
• Updates help text: moves minio from "Available Additional Services" list to an "Additional Services" section with --minio flag syntax
• Updates pgpm docker ls hint from --include <name> to --<name> flag
• Updates display.ts top-level help to show --minio instead of --include for additional services

Breaking: --include minio no longer works. Since #975 was merged very recently, adoption is near-zero.

Review & Testing Checklist for Human

• Verify --minio flag parsing: Run pgpm docker start --minio and confirm inquirerer parses it as { minio: true } so resolveServiceFlags picks it up. The old --include approach explicitly handled string/array parsing; the new approach assumes the arg parser sets a boolean — confirm this works with the actual CLI arg parser
• End-to-end test: pgpm docker start --minio (both containers up), pgpm docker ls (shows minio status), pgpm docker stop --minio (both stop)
• Verify --minio doesn't collide with other args: The new resolveServiceFlags iterates all ADDITIONAL_SERVICES keys and checks args[key] — confirm no existing arg names clash with service names (currently only minio, so low risk)

Notes

• The extensibility model now requires that each service in ADDITIONAL_SERVICES has a key that works as a CLI flag name (e.g., no spaces, hyphens are fine). This is a reasonable constraint.
• No automated tests — this is Docker orchestration code that requires a running Docker daemon to test meaningfully.

Link to Devin session: https://app.devin.ai/sessions/44eca4b3fe5a46aaaf5c4907f0a0b600
Requested by: @pyramation

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