refactor: split src into domain / application / infrastructure layers

Replace the history-driven lib/ + utils/ split with DDD layers:
- domain/: aggregate, repositories, value objects, pure parsers/format
- application/: feed-service, email-processor, feed-fetcher, stats
- infrastructure/: logging, auth, KV/R2 adapters, HTTP, framework glue

Pure file relocation; imports updated mechanically. Behaviour unchanged.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/routes/admin/emails.tsx

@@ -1,6 +1,6 @@
 import { Hono } from "hono";
 import { Env, EmailMetadata } from "../../types";
-import { logger } from "../../lib/logger";
+import { logger } from "../../infrastructure/logger";
 import { Layout, clampText } from "./ui";
 import {
   deleteAttachmentsForEmails,
@@ -8,8 +8,12 @@ import {
 } from "./helpers";
 import { FeedRepository } from "../../domain/feed-repository";
 import { FeedId } from "../../domain/value-objects/feed-id";
-import { feedRssUrl, feedAtomUrl, feedEmailAddress } from "../../utils/urls";
-import { formatBytes } from "../../utils/format";
+import {
+  feedRssUrl,
+  feedAtomUrl,
+  feedEmailAddress,
+} from "../../infrastructure/urls";
+import { formatBytes } from "../../domain/format";
 import { EmailAddress } from "../../domain/value-objects/email-address";
 import { emailsPageScript } from "../../scripts/generated/emails-page";
 

src/routes/admin/feeds.tsx

@@ -1,12 +1,12 @@
 import { Hono } from "hono";
 import { z } from "zod";
 import { Env } from "../../types";
-import { bumpCounters } from "../../utils/stats";
-import { waitUntilSafe } from "../../utils/worker";
-import { feedRssUrl, feedEmailAddress } from "../../utils/urls";
-import { logger } from "../../lib/logger";
-import { sendUnsubscribes } from "../../utils/unsubscribe";
-import { getAttachmentBucket } from "../../utils/attachments";
+import { bumpCounters } from "../../application/stats";
+import { waitUntilSafe } from "../../infrastructure/worker";
+import { feedRssUrl, feedEmailAddress } from "../../infrastructure/urls";
+import { logger } from "../../infrastructure/logger";
+import { sendUnsubscribes } from "../../infrastructure/unsubscribe";
+import { getAttachmentBucket } from "../../infrastructure/attachments";
 import { Layout } from "./ui";
 import { purgeFeedKeysStep, collectUnsubscribeUrls } from "./helpers";
 import { FeedRepository } from "../../domain/feed-repository";
@@ -16,7 +16,7 @@ import {
   editFeed,
   deleteFeedRecord,
   deleteFeedFastDetailed,
-} from "../../lib/feed-service";
+} from "../../application/feed-service";
 
 type AppEnv = { Bindings: Env };
 

src/routes/admin/helpers.ts

@@ -1,6 +1,6 @@
 import { EmailData, EmailMetadata, Env } from "../../types";
-import { logger } from "../../lib/logger";
-import { getAttachmentBucket } from "../../utils/attachments";
+import { logger } from "../../infrastructure/logger";
+import { getAttachmentBucket } from "../../infrastructure/attachments";
 import { FeedRepository } from "../../domain/feed-repository";
 import { FeedId } from "../../domain/value-objects/feed-id";