feat(pgpm): add --minio flag to pgpm env for CDN/S3 environment variables

[pyramation]

Summary

Adds a --minio flag to pgpm env that exports CDN/S3 environment variables (CDN_ENDPOINT, AWS_ACCESS_KEY, AWS_SECRET_KEY, AWS_REGION) alongside the existing PostgreSQL variables. This follows the same opt-in pattern as --supabase — Minio vars are only included when explicitly requested.

pgpm env --minio                  # Postgres + MinIO vars
pgpm env --supabase --minio       # Supabase + MinIO vars
eval "$(pgpm env --minio)"        # Load both into shell
pgpm env --minio pgpm deploy ...  # Run command with both sets

Also fixes the arg-parsing logic: the old code used index-based slicing that only knew about --supabase (everything before --supabase in arg position would be silently dropped). Replaced with a knownFlags filter that cleanly strips recognized flags regardless of position, which also makes it trivial to add future flags.

Context: follows PR #975 which added --include minio to pgpm docker. This gives users a matching way to get the env vars those containers need.

Review & Testing Checklist for Human

• Verify env var naming: This exports CDN_ENDPOINT but CLAUDE.md references MINIO_ENDPOINT for S3/MinIO tests. Confirm CDN_ENDPOINT is correct for the app's upload/streaming packages, or if it should be MINIO_ENDPOINT (or both)
• Verify AWS_ACCESS_KEY vs AWS_ACCESS_KEY_ID: Standard AWS SDK expects AWS_ACCESS_KEY_ID — confirm the codebase uses AWS_ACCESS_KEY (the non-standard name) everywhere
• Test arg parsing edge cases: Run pgpm env --minio, pgpm env --supabase --minio, pgpm env --minio pgpm deploy --database db1 and verify the correct exports are printed and commands execute with the right env
• Confirm defaults match docker command: The Minio defaults here (endpoint http://localhost:9000, creds minioadmin/minioadmin) should match what pgpm docker start --include minio actually starts

Notes

• The help text examples were trimmed to make room for --minio variants — a few --supabase-only examples were removed (the flag still works, just fewer examples shown).
• The arg parsing refactor changes behavior in one edge case: if --supabase appeared after positional command args (e.g., pgpm env createdb --supabase), the old code would drop createdb. The new code preserves it. This is a bug fix.
• No automated tests — this is a CLI env-export command that would need integration testing with actual shell evaluation.

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

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