feat(P01): SLICE-01+02 — Dockerfile, .dockerignore, docker-compose.yml, FastAPI StaticFiles, PRAXIS_DB_PATH env (G-102 fix)

SLICE-01 (lead-developer): multi-stage Dockerfile (node:22-slim→python:3.12-slim),
  .dockerignore (excludes secrets/node_modules/.git), docker-compose.yml
  (port 8789, SQLite volume, env injection for all voice-service vars)
SLICE-02 (backend-engineer+data-engineer): FastAPI mounts client/dist as
  StaticFiles at / after API routes (D-023, REQ-DEPLOY-13).
  G-102 MUST fix: db/store.py + db/migrate.py now read PRAXIS_DB_PATH
  from env so the Docker volume mount persists SQLite data.
G-105 FIX: Dockerfile copies pyproject.toml before source (pip install
  layer cached, source changes don't invalidate).

REQ-DEPLOY-01, 02, 13, 16 covered.

---ci---
project: praxis
phase: 1
milestone: v0.2
status: execute
slice: 01-02
wave: 1
---/ci---

db/migrate.py

@@ -2,10 +2,12 @@
 
 from __future__ import annotations
 
+import os
 import sqlite3
 from pathlib import Path
 
-_DEFAULT_DB_PATH = Path("praxis.db")
+# G-102 FIX: read PRAXIS_DB_PATH from env (must match db/store.py).
+_DEFAULT_DB_PATH = Path(os.environ.get("PRAXIS_DB_PATH", "praxis.db"))
 _DEFAULT_MIGRATIONS_DIR = Path(__file__).resolve().parent / "migrations"
 
 

db/store.py

@@ -13,6 +13,7 @@ No auth — learner_id is the hardcoded 'learner-1' (D-007).
 from __future__ import annotations
 
 import json
+import os
 import uuid
 from dataclasses import dataclass
 from pathlib import Path
@@ -22,7 +23,9 @@ import aiosqlite
 
 from db.migrate import apply_migrations
 
-_DEFAULT_DB_PATH = "praxis.db"
+# G-102 FIX: read PRAXIS_DB_PATH from env so the Docker volume mount
+# actually persists data (docker-compose.yml sets PRAXIS_DB_PATH=/app/data/praxis.db).
+_DEFAULT_DB_PATH = os.environ.get("PRAXIS_DB_PATH", "praxis.db")
 HARDCODED_LEARNER_ID = "learner-1"