chore(search): retimestamp ru_en migration to 20260707T130000 to avoid collision (#529)

Develop introduced two migrations at the exact 20260707T120000 stamp
(ai-chat-metadata, page-history-kind). Three files sharing one timestamp
is fragile for deploy ordering, so move #529's ru_en-config migration to a
strictly-later, unique 20260707T130000 so it orders cleanly last. It touches
only the ru_en text-search config (different tables), so running it after the
develop migrations is order-independent and safe.

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

apps/server/src/core/search/search.service.ts

@@ -24,7 +24,7 @@ import {
 const tsquery = require('pg-tsquery')();
 
 // The FTS text-search configuration used on BOTH the stored side (pages.tsv via
-// its trigger, see migration 20260707T120000) and the query side here. #529
+// its trigger, see migration 20260707T130000) and the query side here. #529
 // acceptance #13 invariant: column config and query config always change as a
 // pair — flip this only alongside the migration.
 const TS_CONFIG = 'ru_en';

apps/server/src/database/migrations/20260707T130000-search-ru-en-config.ts

@@ -152,7 +152,7 @@ async function swapEmbeddingsFtsConfig(
   if (!inlineEmbeddingsRewriteEnabled()) {
     // eslint-disable-next-line no-console
     console.warn(
-      `[migration 20260707T120000] SEARCH_EMBEDDINGS_FTS_INLINE_REWRITE=false: ` +
+      `[migration 20260707T130000] SEARCH_EMBEDDINGS_FTS_INLINE_REWRITE=false: ` +
         `SKIPPING the page_embeddings.fts rewrite to '${config}'. The operator MUST ` +
         `perform this fts swap out-of-band. Until then the RAG lexical leg stays on ` +
         `its current config while the query config is '${config}' (documented, ` +
@@ -232,7 +232,7 @@ export async function down(db: Kysely<any>): Promise<void> {
   if ((await embeddingsFtsExpr(db)).includes('ru_en')) {
     // eslint-disable-next-line no-console
     console.warn(
-      `[migration 20260707T120000] down(): page_embeddings.fts still references ` +
+      `[migration 20260707T130000] down(): page_embeddings.fts still references ` +
         `ru_en (inline rewrite was gated off) — leaving the ru_en text-search ` +
         `configuration in place. Drop it out-of-band once fts is back on 'english'.`,
     );

apps/server/test/integration/search-ru-en-migration.int-spec.ts

@@ -1,6 +1,6 @@
 import { Kysely, sql } from 'kysely';
 import { getTestDb, destroyTestDb } from './db';
-import * as migration from '../../src/database/migrations/20260707T120000-search-ru-en-config';
+import * as migration from '../../src/database/migrations/20260707T130000-search-ru-en-config';
 
 /**
  * #529 A1 — the ru_en config migration must be REVERSIBLE in the correct order: