feat(db): add webhook schema, migration, and repository (#391)

* feat(db): add webhook schema, migration, and repository

Add the database foundation for workspace webhooks:

- Add workspace_webhooks table with migration (webhook_event enum,
  URL, secret, event subscriptions, active flag)
- Add webhook repository with CRUD operations
- Add webhooks schema definition with relations
- Extend card and list repos to return board/list names for
  webhook payload context

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(db): remove unused webhook_event enum and fix migration timestamp

- Remove dead webhook_event pgEnum from schema (events column uses text)
- Remove CREATE TYPE statement from migration SQL
- Fix migration journal timestamp to be chronologically after the
  notifications migration (idx 25)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat(db): return boardPublicId from card and list repo queries

Add board publicId to getWorkspaceAndCardIdByCardPublicId and
getWorkspaceAndListIdByListPublicId return values, needed for
correct boardId in webhook payloads.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(db): add workspaceId index and document secret exposure

- Add index on workspaceId for efficient webhook lookups per workspace
- Add JSDoc comment on getActiveByWorkspaceId explaining that it
  returns secrets for server-side HMAC signing only and must never
  be exposed via client-facing endpoints

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor(db): extract parseEvents helper in webhook repo

DRY up 6 repeated JSON.parse-and-cast calls into a single helper
function, addressing reviewer feedback on PR #391.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/src/repository/list.repo.ts

@@ -419,12 +419,14 @@ export const getWorkspaceAndListIdByListPublicId = async (
   listPublicId: string,
 ) => {
   const result = await db.query.lists.findFirst({
-    columns: { id: true, createdBy: true },
+    columns: { id: true, name: true, createdBy: true },
     where: and(eq(lists.publicId, listPublicId), isNull(lists.deletedAt)),
     with: {
       board: {
         columns: {
+          publicId: true,
           workspaceId: true,
+          name: true,
         },
       },
     },
@@ -433,8 +435,11 @@ export const getWorkspaceAndListIdByListPublicId = async (
   return result
     ? {
         id: result.id,
+        name: result.name,
         createdBy: result.createdBy,
         workspaceId: result.board.workspaceId,
+        boardPublicId: result.board.publicId,
+        boardName: result.board.name,
       }
     : null;
 };