adapter-sqlite: all repo implementations + wire fn + migrations copy

migrations_sqlite/20260314000000_add_local_files_index.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS local_files_index (
+    id          TEXT    PRIMARY KEY,
+    rel_path    TEXT    NOT NULL UNIQUE,
+    title       TEXT    NOT NULL,
+    duration_secs INTEGER NOT NULL DEFAULT 0,
+    year        INTEGER,
+    tags        TEXT    NOT NULL DEFAULT '[]',
+    top_dir     TEXT    NOT NULL DEFAULT '',
+    scanned_at  TEXT    NOT NULL
+);