Standalone Shonar Desktop: vendor portable sources + local engine; decouple from ~/Projects/Shonar

- shared/ = portable Android-origin sources vendored from deferred/desktop-server
  (app/build.gradle.kts srcDir repointed; PlaybackController.kt excluded as Android-only)
- backend/ = bundled-lite engine (SQLite + inline queue); .venv symlinked from the
  old checkout, PYTHONPATH pins THIS backend's code over any editable install
- repoRoot() resolves this project dir (env SHONAR_REPO still wins); desktop-dev.sh
  watches shared/ + backend/
- Verified: :app:compileKotlin + :app:test green (23 tests); engine boots on :8010,
  self-migrates, /healthz ok

backend/shonar/api/schemas_search.py

@@ -0,0 +1,23 @@
+"""Search + export schemas (M9)."""
+
+from __future__ import annotations
+
+import uuid
+
+from pydantic import BaseModel
+
+
+class SearchHitOut(BaseModel):
+    id: uuid.UUID
+    title: str
+    field: str  # title | tag | notes | summary | transcript
+    snippet: str
+
+
+class SearchOut(BaseModel):
+    query: str
+    scope: str
+    items: list[SearchHitOut]
+    total: int
+    limit: int
+    offset: int