Integrate Effect-based userThreads model into modLog

Updates modLog.ts to use the Effect-based userThreads implementation
via the legacy wrapper functions. This validates the Effect migration
approach while maintaining backward compatibility.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vcarl

app/helpers/modLog.ts

@@ -11,6 +11,11 @@ import {
   type User,
 } from "discord.js";
 
+import {
+  createUserThreadLegacy as createUserThread,
+  getUserThreadLegacy as getUserThread,
+  updateUserThreadLegacy as updateUserThread,
+} from "#~/effects/models/userThreads.js";
 import {
   constructDiscordLink,
   describeAttachments,
@@ -31,11 +36,6 @@ import {
   ReportReasons,
   type Report,
 } from "#~/models/reportedMessages.server";
-import {
-  createUserThread,
-  getUserThread,
-  updateUserThread,
-} from "#~/models/userThreads.server";
 
 import { retry } from "./misc";
 import { log } from "./observability";