feat(pgpm): add --pglite flag to init with workspace inheritance

[pyramation]

Summary

Adds a --pglite flag to pgpm init that scaffolds from the pglite-boilerplates repo (in-process WASM Postgres, no server/Docker) instead of the default pgpm-boilerplates. The key UX win is inheritance: use --pglite once when creating the workspace, and later bare pgpm init calls inside it scaffold pglite modules automatically — no need to repeat the flag.

pgpm init workspace --pglite   # records the source in the workspace pgpm.json
pgpm init                      # inside that workspace → inherits pglite, no flag
pgpm init --pglite | --repo …  # explicit flags still override the inherited default

How it works

--pglite is pure sugar over --repo (with --repo winning):

resolveInitTemplateRepo({ repo, pglite }) => { templateRepo, repoWasExplicit }
//   --repo X            → X,                     explicit
//   --pglite            → PGLITE_TEMPLATE_REPO,  explicit
//   (neither)           → DEFAULT_TEMPLATE_REPO, not explicit

Persistence + inheritance:

• handleWorkspaceInit: after scaffolding, if templateRepo !== DEFAULT_TEMPLATE_REPO, write a boilerplates: { repo, branch?, dir? } field into the workspace pgpm.json.
• handleModuleInit: when !repoWasExplicit, read the enclosing workspace's boilerplates and use it as the template source. Explicit --pglite/--repo skips inheritance.

One supporting fix in resolveWorkspaceTemplateRepo (the -w combined path): for a non-default (single-family) repo, leave the variant dir undefined so the repo's own .boilerplates.json resolves it (e.g. pglite/), instead of forcing dir = workspaceType which only makes sense for the multi-family default repo.

Supporting changes

• @pgpmjs/core: new PGLITE_TEMPLATE_REPO constant.
• @pgpmjs/types: new optional PgpmWorkspaceConfig.boilerplates field.
• New pgpm/cli/src/commands/init/boilerplate.ts holds the resolve/persist/read helpers (unit-testable, no network).

Tests

• init.boilerplate.test.ts — unit tests for flag resolution + persist/read round-trip (network-free).
• init.test.ts — a gated end-to-end test (skipped in CI like the sibling --repo/--create-workspace tests): init workspace --pglite records the pglite repo, then bare init inherits it and scaffolds a module using pglite-test (not pgsql-test). Verified locally against the live boilerplate repos.

Not in this PR

Wiring --pglite into deploy/verify/revert via the pluggable driver contract (#1352) is a separate follow-up; this PR is scaffolding-only.

Link to Devin session: https://app.devin.ai/sessions/424b76f81a60499493ac946b57136ad9
Requested by: @pyramation

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[devin-ai-integration]

Consolidated into #1358 per request to reduce open PR count. Same commits, merged into one branch.