M1: backend core + proposal engine

- FastAPI skeleton, SQLAlchemy models (§13), Alembic initial migration
- SchedulingProvider interface with google_calendar (free/busy read-only),
  partner_api (Appendix B client) and mock implementations
- Proposal engine: create → provider-routed delivery → owner actions
  (resolve/confirm+SMS/reject) → expiry + reminders (§9)
- Signed single-use action links, .ics METHOD:REQUEST attachment
- Partner outcome webhook with HMAC verification + polling fallback
- SmsProvider (console) with Bosnian templates (§5.5), EmailProvider (console/SMTP)
- Fake partner API server in tests/ — Appendix B reference implementation
- 43 tests: slot math, proposal lifecycle, action links, partner contract

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pyproject.toml

@@ -0,0 +1,61 @@
+[project]
+name = "gogotelefon"
+version = "0.1.0"
+description = "Gogo Telefon — voice-first AI receptionist for small service businesses in BiH"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi>=0.115",
+    "uvicorn[standard]>=0.30",
+    "sqlalchemy>=2.0",
+    "alembic>=1.13",
+    "psycopg[binary]>=3.2",
+    "pydantic>=2.8",
+    "pydantic-settings>=2.4",
+    "jinja2>=3.1",
+    "python-multipart>=0.0.9",
+    "itsdangerous>=2.2",
+    "cryptography>=43.0",
+    "bcrypt>=4.2",
+    "httpx>=0.27",
+    "aiosmtplib>=3.0",
+    "icalendar>=5.0",
+    "apscheduler>=3.10",
+    "anthropic>=0.40",
+    "google-auth>=2.34",
+    "google-auth-oauthlib>=1.2",
+    "qrcode[pil]>=7.4",
+    "websockets>=13.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.3",
+    "pytest-asyncio>=0.24",
+    "pytest-httpx>=0.32",
+    "ruff>=0.6",
+    "aiosqlite>=0.20",
+    "greenlet>=3.0",
+]
+voice = [
+    "pipecat-ai>=0.0.40",
+    "faster-whisper>=1.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["gogo"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "UP", "B"]
+ignore = ["E501", "B008"]  # B008: Depends(...) in defaults is FastAPI idiom