Initial WhatToDo app

Self-hosted personal task list: FastAPI + SQLite in Docker, mobile-friendly
PWA frontend, deadlines, priorities, categories, tags, notes, checklists,
recurring tasks, single-password login, and JSON export/import.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,24 @@
+services:
+  whattodo:
+    build:
+      context: .
+      target: runtime
+    image: whattodo:latest
+    restart: unless-stopped
+    env_file: .env
+    ports:
+      # BIND_ADDR=127.0.0.1 -> this computer only; 0.0.0.0 -> also reachable from your phone on the LAN.
+      - "${BIND_ADDR:-127.0.0.1}:${PORT:-8080}:8000"
+    volumes:
+      - ./data:/data
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://127.0.0.1:8000/api/health')"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+
+  test:
+    build:
+      context: .
+      target: test
+    profiles: ["test"]