feat(application): add groups, comments, and ordering to app config items

[microbluey]

Summary

Env/file config items were a flat, unordered list keyed only by name, which becomes hard to read once an app has dozens of variables. This adds three pieces of per-item metadata — a display group, a free-text comment, and a manual order — without introducing a database table.

The metadata is serialized as JSON in a new oops.config-meta annotation (key -> {group, comment, order}) on each {app} / {app}.files ConfigMap/Secret, mirroring the existing oops.mounts annotation pattern. Key properties:

• data is untouched — only metadata.annotations gains oops.config-meta, so nothing changes about how the ConfigMap/Secret is injected (envFrom) or mounted.
• Each annotation only describes the keys in its own resource's data, so an item moving between env / secret / file-mounted carries its metadata along on the next full-rewrite save.
• The metadata never enters the container.
• order lets the editor persist a manual arrangement that the ConfigMap data map (unordered) cannot; getConfigMaps sorts by it, with legacy/unset items falling back to key name.
• Zero migration: pre-existing resources have no annotation → group/comment/order are all null.

What the stored K8s resources look like

Env-injected ConfigMap (envFrom), unchanged data, new annotation only:

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-app
  namespace: prod
  annotations:
    oops.config-meta: '{"DB_HOST":{"group":"database","comment":"Primary DB host","order":0},"DB_PORT":{"group":"database","order":1},"APP_NAME":{"order":2}}'
  ownerReferences:
    - apiVersion: apps/v1
      kind: StatefulSet
      name: my-app
      controller: true
      blockOwnerDeletion: true
data:
  DB_HOST: "10.0.0.1"
  DB_PORT: "3306"
  APP_NAME: "My Application"

Companion .files ConfigMap (mounted, never injected) carrying both annotations side by side:

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-app.files
  namespace: prod
  annotations:
    oops.mounts: '{"config.yml":"/etc/app/config.yml"}'
    oops.config-meta: '{"config.yml":{"group":"files","order":3}}'
data:
  config.yml: |
    key: value

Frontend

• Config editor reworked into collapsible per-group sections with a key/comment search box.
• Each row gains an inline comment field and a group popover (pick an existing group or create a new one).

Testing

• Backend: ConfigMetaAnnotationTests covers of() normalization, independent mount/meta serialization, full annotation round-trip including order preservation, legacy meta without an order field, and garbled/missing annotation handling.
• Frontend: pnpm lint and tsc --noEmit pass.