feat(m0): bootstrap repo, design system, compose stack

- Repo scaffolding: .gitignore, .env.example, Makefile, docker-compose.yml,
  README.md, CHANGELOG.md, pre-commit config.
- Three-service stack: api (Flask 3), db (postgres:16-alpine), front (nginx
  serving the Vite bundle). Named volumes metamorph_db + metamorph_evidence.
- Backend skeleton: Flask app factory, JSON structured logging on stdout,
  GET /api/v1/health, multi-stage Dockerfile, pyproject.toml driven by uv,
  Pydantic Settings with secret guard rails (refuses to boot in non-dev with
  placeholders), APP_ENV gating.
- Frontend skeleton: Vite + React 18 + TypeScript strict + TailwindCSS, RTOps
  design tokens from tasks/design.md, self-hosted JetBrains Mono / IBM Plex
  Sans via @fontsource, base UI primitives (Card/Tag/SectionHeader/FlowNode/
  Button), home page wired to /api/v1/health.
- Engine-agnostic Makefile: auto-detects docker or podman, picks the matching
  compose driver. Targets: up/down/build/rebuild/dev/lint/fmt/test/migrate/
  seed-mitre/print-install-token/e2e/inspect-health.
- Playwright suite: e2e/tests/m0-smoke.spec.ts (8 tests) + HTML + JUnit
  reports + traces on retry.
- Docs: tasks/spec.md (finalized after Q&A), tasks/design.md, tasks/todo.md
  (14 milestones), tasks/testing-m0.md, tasks/lessons.md.

DoD: make up + make health + make e2e all pass on podman 5.x (Fedora) and
docker. TLS terminated by external reverse proxy (spec §6 NF-network).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/README.md

@@ -0,0 +1,39 @@
+# Metamorph backend
+
+Flask 3 API. See repo root `README.md` for the big picture.
+
+## Layout
+
+```
+app/
+├── api/        # HTTP layer (blueprints), versioned under /api/v1
+├── core/       # config (env-driven), structured logging
+├── db/         # SQLAlchemy session + Alembic (M1+)
+├── models/     # ORM models (M1+)
+├── services/   # domain logic (M2+)
+└── i18n/       # message catalogs (M13)
+tests/          # pytest
+```
+
+## Local dev
+
+Requires [uv](https://github.com/astral-sh/uv) and a reachable Postgres (M1+; not needed yet for `/health`).
+
+```bash
+uv sync                                            # install deps from pyproject.toml
+uv run flask --app app.main run --debug --port 8000
+curl http://localhost:8000/api/v1/health
+```
+
+## Tests
+
+```bash
+uv run pytest
+```
+
+## Lint
+
+```bash
+uv run ruff check .
+uv run ruff format .
+```