Add conflict resolution diff UI and app branding

apps/server/internal/database/migrations/000008_sync.up.sql

@@ -0,0 +1,35 @@
+CREATE TABLE IF NOT EXISTS api_keys (
+    id TEXT PRIMARY KEY,
+    user_id TEXT NOT NULL,
+    name TEXT NOT NULL,
+    key_hash TEXT NOT NULL UNIQUE,
+    scopes TEXT NOT NULL DEFAULT 'sync:read,sync:write',
+    created_at TEXT NOT NULL,
+    expires_at TEXT,
+    last_used_at TEXT,
+    FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_api_keys_key_hash ON api_keys(key_hash);
+
+CREATE TABLE IF NOT EXISTS sync_snapshots (
+    id TEXT PRIMARY KEY,
+    device_id TEXT NOT NULL,
+    user_id TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_sync_snapshots_device ON sync_snapshots(device_id);
+
+CREATE TABLE IF NOT EXISTS sync_files (
+    snapshot_id TEXT NOT NULL,
+    path TEXT NOT NULL,
+    hash TEXT NOT NULL,
+    size_bytes INTEGER NOT NULL DEFAULT 0,
+    modified_at TEXT NOT NULL,
+    PRIMARY KEY (snapshot_id, path),
+    FOREIGN KEY(snapshot_id) REFERENCES sync_snapshots(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_sync_files_hash ON sync_files(hash);