refactor: move KV repositories to infrastructure (Track P — points 2, 6c)

Make the domain stop depending on infrastructure ("imports point inward").

- Point 2: relocate the four KV adapters (FeedRepository, IconRepository,
  WebSubSubscriptionRepository, CountersRepository) from domain/ to
  infrastructure/, where the logger import is legitimate. The domain now keeps
  only the pure key schema (feed-keys.ts), the Feed aggregate and value objects;
  it imports nothing outward. Deliberately no hand-rolled 24-method port
  interface (YAGNI without DI) — relocation alone fixes the direction.
- Point 6c: EmailParser.extractFeedId now returns a validated FeedId value
  object instead of a raw string, so the most untrusted input (an inbound
  recipient address) is guarded at the parse boundary and no longer round-trips
  through FeedId.fromTrusted in the ingest path.

All import paths updated; CLAUDE.md source layout/KV-schema notes updated.
351 tests pass; tsc --noEmit clean.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/infrastructure/counters-repository.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect } from "vitest";
+import { createMockEnv } from "../test/setup";
+import { CountersRepository } from "./counters-repository";
+import type { Env } from "../types";
+
+const mockEnv = () => createMockEnv() as unknown as Env;
+
+describe("CountersRepository", () => {
+  it("round-trips the counters singleton", async () => {
+    const repo = new CountersRepository(mockEnv().EMAIL_STORAGE);
+    expect(await repo.getRaw()).toBeNull();
+    await repo.put({
+      feeds_created: 1,
+      feeds_deleted: 0,
+      emails_received: 2,
+      emails_rejected: 0,
+      unsubscribes_sent: 0,
+    });
+    expect(await repo.getRaw()).toMatchObject({ emails_received: 2 });
+  });
+});