refactor: organize API around operation domains (#24)

* feat: reorganize API around operation domains

Restructure the oRPC contract from 14 resource-oriented routers to 8
domain-oriented routers for a cleaner public API surface.

- Consolidate 7 watch procedures into unified tracking.watch/unwatch
  with scope + ids input (movie, episode, season, series)
- Split dashboard across tracking (stats, history), library
  (continueWatching, upcoming), and discover (recommendations)
- Merge explore + search + discover into single discover router
- Absorb integrations into account.integrations
- Merge system.authConfig into system.publicInfo
- Collapse 6 admin setting endpoints into admin.settings.get/update
- Deduplicate platforms.list + explore.watchProviders into
  discover.platforms
- Add symmetric unwatchMovie/unwatchSeries core functions
- Rename titles.detail→get, titles.recommendations→similar,
  people.detail→get

BREAKING CHANGE: All client API paths have changed. REST paths now
mirror router structure.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: address review feedback on API reorganization

- Fix updateRating invalidation in native app — was only invalidating
  title queries, now calls invalidateTitleQueries() to also refresh
  tracking.userInfo (drives the rating UI)
- Make unwatchMovie status revert consistent with unwatchSeries — revert
  any non-watchlist status, not just "completed"
- Add sync invariant comment on handleWatch/handleUnwatch loops
- Remove unused queryClient import in native use-title-actions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: updateStatus NOT_FOUND error + rate() invalidation in native

- updateStatus now throws NOT_FOUND when quickAddTitle returns null
  (title doesn't exist), instead of silently succeeding
- Add NOT_FOUND error to updateStatus contract definition
- Fix rate() in native title-actions.ts to call invalidateTitleQueries()
  instead of only invalidating orpc.titles.key() — mirrors the fix
  already applied to the hook-based path in d2ddc0f

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: expand mobile app docs and add Play Store badge

- Add the Google Play badge to the README alongside the App Store badge
- Expand the mobile app docs with the Android/Play Store release details
- Refresh docs site dependencies and related package versions for the updated docs stack

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/core/test/tracking.test.ts

@@ -26,7 +26,9 @@ import {
   removeTitleStatus,
   setTitleStatus,
   unwatchEpisode,
+  unwatchMovie,
   unwatchSeason,
+  unwatchSeries,
 } from "../src/tracking";
 
 beforeEach(() => {
@@ -495,6 +497,93 @@ describe("unwatchSeason", () => {
 
 // ── rateTitleStars ──────────────────────────────────────────────────
 
+// ── unwatchMovie ─────────────────────────────────────────────────────
+
+describe("unwatchMovie", () => {
+  test("removes movie watch records and reverts completed to watchlist", () => {
+    insertUser();
+    insertTitle();
+    logMovieWatch("user-1", "title-1");
+
+    // Verify completed status
+    const before = testDb
+      .select()
+      .from(userTitleStatus)
+      .where(and(eq(userTitleStatus.userId, "user-1"), eq(userTitleStatus.titleId, "title-1")))
+      .get();
+    expect(before?.status).toBe("completed");
+
+    unwatchMovie("user-1", "title-1");
+
+    // Watch records removed
+    const watches = testDb
+      .select()
+      .from(userMovieWatches)
+      .where(and(eq(userMovieWatches.userId, "user-1"), eq(userMovieWatches.titleId, "title-1")))
+      .all();
+    expect(watches).toHaveLength(0);
+
+    // Status reverted to watchlist
+    const after = testDb
+      .select()
+      .from(userTitleStatus)
+      .where(and(eq(userTitleStatus.userId, "user-1"), eq(userTitleStatus.titleId, "title-1")))
+      .get();
+    expect(after?.status).toBe("watchlist");
+  });
+
+  test("no-op when movie was not watched", () => {
+    insertUser();
+    insertTitle();
+    setTitleStatus("user-1", "title-1", "watchlist");
+
+    unwatchMovie("user-1", "title-1");
+
+    const row = testDb
+      .select()
+      .from(userTitleStatus)
+      .where(and(eq(userTitleStatus.userId, "user-1"), eq(userTitleStatus.titleId, "title-1")))
+      .get();
+    expect(row?.status).toBe("watchlist");
+  });
+});
+
+// ── unwatchSeries ────────────────────────────────────────────────────
+
+describe("unwatchSeries", () => {
+  test("removes all episode watches and reverts status to watchlist", () => {
+    const { episodeIds } = insertTvShow("tv-1");
+    insertUser();
+    logEpisodeWatch("user-1", episodeIds[0]);
+    logEpisodeWatch("user-1", episodeIds[1]);
+
+    const before = testDb
+      .select()
+      .from(userEpisodeWatches)
+      .where(eq(userEpisodeWatches.userId, "user-1"))
+      .all();
+    expect(before.length).toBeGreaterThan(0);
+
+    unwatchSeries("user-1", "tv-1");
+
+    const after = testDb
+      .select()
+      .from(userEpisodeWatches)
+      .where(eq(userEpisodeWatches.userId, "user-1"))
+      .all();
+    expect(after).toHaveLength(0);
+
+    const statusRow = testDb
+      .select()
+      .from(userTitleStatus)
+      .where(and(eq(userTitleStatus.userId, "user-1"), eq(userTitleStatus.titleId, "tv-1")))
+      .get();
+    expect(statusRow?.status).toBe("watchlist");
+  });
+});
+
+// ── rateTitleStars ───────────────────────────────────────────────────
+
 describe("rateTitleStars", () => {
   test("sets rating", () => {
     insertUser();