chore: run the app from a venv and read configuration from a dotenv (#95)

pyproject.toml

@@ -8,18 +8,32 @@ dependencies = [
     "sqlalchemy>=2.0",
     "alembic>=1.13",
     "pydantic>=2.7",
-]
-
-[project.optional-dependencies]
-test = [
-    "pytest>=8",
-    "httpx>=0.27",
+    # Imaging is runtime, not test-only: thumbnails decode through Pillow, and the
+    # perceptual hash is a DCT over the decoded pixels (services/hashing.py).
     "pillow>=10",
     "numpy>=1.26",
     "scipy>=1.11",
+]
+
+[project.optional-dependencies]
+# The cloud vision provider. Optional because the analysis stage is the only thing
+# that needs it, and a local review-only install should not pull an API client.
+vision = ["openai>=1.30"]
+test = [
+    "pytest>=8",
+    "httpx>=0.27",
     "playwright>=1.40",
     "pytest-playwright>=0.4",
 ]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+# The importable application. ``migrations`` and ``work_item`` live beside it but
+# are not part of the package; without this, an editable install cannot guess.
+packages = ["photo_pipeline"]
 # Browser end-to-end tests also require: python -m playwright install chromium
 
 [tool.ruff]