Initial scaffold: FocusFlow ADHD Task Manager backend

Dart Shelf API with modules: auth (JWT + PBKDF2), tasks (CRUD + dopamine scorer),
streaks (forgiveness + freeze), rewards (variable reward engine), time perception,
sync (offline-first push/pull), rooms (body doubling placeholder).
Includes DB migration (001_initial_schema.sql) and Docker Compose.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,21 @@
+# Use latest stable channel SDK.
+FROM dart:stable AS build
+
+# Resolve app dependencies.
+WORKDIR /app
+COPY pubspec.* ./
+RUN dart pub get
+
+# Copy app source code (except anything in .dockerignore) and AOT compile app.
+COPY . .
+RUN dart compile exe bin/server.dart -o bin/server
+
+# Build minimal serving image from AOT-compiled `/server`
+# and the pre-built AOT-runtime in the `/runtime/` directory of the base image.
+FROM scratch
+COPY --from=build /runtime/ /
+COPY --from=build /app/bin/server /app/bin/
+
+# Start server.
+EXPOSE 8080
+CMD ["/app/bin/server"]