chore(release): v1.13.0 — per-user custom mood tags + catalogue hide

Let a user shape their own mood-tag set on top of the global catalogue:
create custom tags (label encrypted at rest, icon from a fixed allow-list),
and hide built-in tags per user. Custom tags live in `mood_tags` with a
non-null `user_id` and a `custom:<uuid>` key; `GET /api/mood/tags` returns
the effective per-user set (catalogue − hidden + own customs) with new
`custom` + `label` fields, and `?include=hidden` surfaces hidden catalogue
tags for the management screen. The write path resolves a `custom:` key only
against the caller's own rows — a foreign custom key is dropped, never linked.
Delete soft-deactivates by default (history intact); `?purge=true` removes
the row and its links. BINARY-only for v1.

New: POST/PATCH/DELETE /api/mood/tags/custom[/:key], PUT /api/mood/tags/:key/hidden,
migration 0127 (user_id + label_encrypted columns, mood_tag_hidden table,
`custom` category). Integration setup snapshots + restores the seeded catalogue
because the new mood_tags→users FK makes TRUNCATE users CASCADE wipe it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.12.12
+  version: 1.13.0
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.