fix(audit-logs): route request audit log reads through logsDb

Route the read paths in queryRequestAuditLog.ts and
queryRequestAnalytics.ts through `logsDb` instead of
`primaryLogsDb`, matching the existing private audit log routes
(queryActionAuditLog, queryAccessAuditLog, queryConnectionAuditLog
all already use `logsDb`). In PostgreSQL deployments configured
with a read replica via `withReplicas` (see server/db/pg/logsDriver.ts),
this keeps high-volume audit log reads off the primary. No-op
in OSS-SQLite where `logsDb === primaryDb`.

Investigated rewriting `queryUniqueFilterAttributes` per the
in-line TODO ("SOMEONE PLEASE OPTIMIZE THIS!!!!!"). A candidate
rewrite using UNION ALL with six GROUP BY...LIMIT 500 arms
benchmarked 48-61% slower than the current SELECT DISTINCT
LIMIT 501 approach on SQLite (100k/300k/1M rows, 20 runs each):
each grouped arm materializes a temp B-tree before applying LIMIT,
while DISTINCT short-circuits via hash dedup with early exit.
A materialized facets table is likely the right long-term fix,
not a query-shape rewrite.

server/routers/auditLogs/queryRequestAnalytics.ts

@@ -1,4 +1,4 @@
-import { logsDb, requestAuditLog, driver, primaryLogsDb } from "@server/db";
+import { logsDb, requestAuditLog, driver } from "@server/db";
 import { registry } from "@server/openApi";
 import { NextFunction } from "express";
 import { Request, Response } from "express";
@@ -74,12 +74,12 @@ async function query(query: Q) {
         );
     }
 
-    const [all] = await primaryLogsDb
+    const [all] = await logsDb
         .select({ total: count() })
         .from(requestAuditLog)
         .where(baseConditions);
 
-    const [blocked] = await primaryLogsDb
+    const [blocked] = await logsDb
         .select({ total: count() })
         .from(requestAuditLog)
         .where(and(baseConditions, eq(requestAuditLog.action, false)));
@@ -90,7 +90,7 @@ async function query(query: Q) {
 
     const DISTINCT_LIMIT = 500;
 
-    const requestsPerCountry = await primaryLogsDb
+    const requestsPerCountry = await logsDb
         .selectDistinct({
             code: requestAuditLog.location,
             count: totalQ
@@ -118,7 +118,7 @@ async function query(query: Q) {
     const booleanTrue = driver === "pg" ? sql`true` : sql`1`;
     const booleanFalse = driver === "pg" ? sql`false` : sql`0`;
 
-    const requestsPerDay = await primaryLogsDb
+    const requestsPerDay = await logsDb
         .select({
             day: groupByDayFunction.as("day"),
             allowedCount: