feat(pgpm): rename --template-path to --template flag

[pyramation]

Summary

Renames the --template-path flag to --template (with -t alias) for a cleaner CLI experience. The new --template flag can parse combined paths like pnpm/module and automatically extract the dir and fromPath components.

New usage:

pgpm init --template pnpm/module    # Equivalent to: pgpm init module --dir pnpm
pgpm init -t pgpm/workspace         # Short form

Backward compatibility is maintained - --template-path still works but is deprecated.

Updates since last revision

• Fixed -w alias: Added missing CLI alias mapping for -w → createWorkspace. Without this, pgpm init --template pgpm/module -w would fail with "NOT_IN_WORKSPACE" error.
• Updated README: Documented the new --template and -w flags in the Getting Started section and updated the Templates section to reference --template instead of --template-path.

Review & Testing Checklist for Human

• Test --template with -w flag together: Run pgpm init --template pgpm/module -w outside a workspace - should create workspace first, then module inside it
• Verify parsing edge cases: Test with --template workspace (no slash), --template pnpm/sub/module (multiple slashes), and --template /module (leading slash)
• Test precedence behavior: When both --template pnpm/module and --dir supabase are provided, --template silently overrides --dir - verify this is the desired behavior
• Verify backward compatibility: Test that --template-path pgpm/workspace still works as expected

Recommended test plan:

# Test new flag with create-workspace
pgpm init --template pnpm/module -w   # Should create workspace + module

# Test new flag standalone
pgpm init --template pnpm/workspace
pgpm init -t pgpm/module

# Test backward compatibility  
pgpm init --template-path pgpm/workspace

# Test edge cases
pgpm init --template workspace  # No slash - should work as fromPath only

Notes

This PR depends on the pgpm-boilerplates repo having the pgpm/ folder (merged in PR #25).

Link to Devin run: https://app.devin.ai/sessions/86fc90000ad24b2cacf3b750dc077be3
Requested by: Dan Lynch (@pyramation)

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