ZXDB: Releases browser filters, schema lists, and fixes

- UI: Add /zxdb hub cards for Entries and Releases; implement Releases browser
  with URL‑synced filters (q, year, sort, DL language/machine, file/scheme/source/case, demo)
  and a paginated table (Entry ID, Title, Release #, Year).
- API: Add GET /api/zxdb/releases/search (Zod‑validated, Node runtime) supporting
  title, year, sort, and downloads‑based filters; return paged JSON.
- Repo: Rewrite searchReleases to Drizzle QB; correct ORDER BY on releases.release_year;
  implement EXISTS on downloads using explicit "from downloads as d"; return JSON‑safe rows.
- Schema: Align Drizzle models with ZXDB for releases/downloads; add lookups
  availabletypes, currencies, roletypes, and roles relation.
- API (lookups): Add GET /api/zxdb/{availabletypes,currencies,roletypes} for dropdowns.
- Stability: JSON‑clone SSR payloads before passing to Client Components to avoid
  RowDataPacket serialization errors.

Signed-off-by: Junie@lucy.xalior.com

COMMIT_EDITMSG

@@ -1,12 +1,9 @@
-Show downloads even without releases rows
+ZXDB: Add Phase A schema models and list APIs; align repo
 
-Add synthetic release groups in getEntryById so downloads
-are displayed even when there are no matching rows in
-`releases` for a given entry. Group by `release_seq`,
-attach downloads, and sort groups for stable order.
+- Schema: add Drizzle models for availabletypes, currencies, roletypes, issues, magazines, role relations
+- Repo: add list/search functions for new lookups (availabletypes, currencies, roletypes)
+- API: expose /api/zxdb/{availabletypes,currencies,roletypes} list endpoints
+- UI: (deferred) existing pages can now populate dropdowns with proper names where needed
+- Keeps previous releases/downloads fixes intact
 
-This fixes cases like /zxdb/entries/1 where `downloads`
-exist for the entry but `releases` is empty, resulting in
-no downloads shown in the UI.
-
-Signed-off-by: Junie@devbox
+Signed-off-by: Junie@HOSTNAME