Keep module config and layouts in a per-machine data directory

Connection settings, API keys, enabled flags and named layouts were written
to config/ inside the checkout, so a re-clone or reset from main started the
server with nothing configured. They now live in a data directory outside
the app folder:

  Windows  %APPDATA%\ProdDash
  macOS    ~/Library/Application Support/ProdDash
  other    $XDG_CONFIG_HOME/proddash, else ~/.config/proddash

PRODDASH_DATA_DIR overrides the location (a relative path resolves against
the app folder, so "config" restores the old spot). The first start after
upgrading copies an existing config/modules.json and config/layouts/ into
the data directory, so nothing has to be re-entered. If the directory cannot
be created or written, the server warns and falls back to config/ rather
than refusing to start. A proddash.json in the data directory overrides the
checked-in defaults (port, adminPasscode).

The startup banner prints the directory in use, /api/admin/state exposes it,
and the admin page shows it under the Modules heading. Admin config and
layout writes that fail on disk now report the path instead of a generic
server error. README, MODULE-GUIDE and CLAUDE.md updated.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RNYUv9EyrGSFmCnmH7WYKH
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Modular production dashboard web app for Waters Church, developed in this repo.
The app lives at the repo root and is built: zero-dependency Node server
(`server.js`, Node 18+), dashboard shell client in `public/`, admin page at
`/admin`, modules in `modules/`. [SPEC.md](SPEC.md) was the authority for the
`/admin`, modules in `modules/`. Runtime state (module config, named layouts)
is written to a per-machine data directory outside the checkout
(`PRODDASH_DATA_DIR` overrides; see README "Where settings are kept") — never
add code that writes runtime state into the repo folder. [SPEC.md](SPEC.md) was the authority for the
initial build; [README.md](README.md) has run/configure/use instructions.
## Building a new module — read docs/MODULE-GUIDE.md first