chore(v2): restructure monorepo to src/ layout with uv

Aligns the repo with the python-project-spec-design.md template chosen
for V2.0.0. Big move, no logic changes. The 3 pre-existing test
failures (test_recipes::test_update_recipe, test_recipes::
test_recipe_versioning, test_tasks::test_reorder_tasks, plus the
client test_save_measurement_proxy) survive unchanged.

Layout changes
- server/        -> src/backend/
- server/middleware/ -> src/backend/api/middleware/
- server/routers/    -> src/backend/api/routers/
- server/models/     -> src/backend/models/orm/
- server/schemas/    -> src/backend/models/api/
- server/uploads/    -> uploads/ (project root, mounted volume)
- server/tests/      -> src/backend/tests/
- client/            -> src/frontend/flask_app/ (Flask kept; React
  deroga is documented in CLAUDE.md, justified by tablet UX, USB
  caliper/barcode workflow and Fabric.js integration)

Tooling
- pyproject.toml: monorepo with [project] core deps and
  optional-dependencies server / client / dev. Replaces both
  server/requirements.txt and client/requirements.txt.
- uv.lock + .python-version (3.11) committed for reproducible builds.
- Dockerfile (root, backend) and Dockerfile.frontend rewritten to use
  uv sync --frozen --no-dev --extra server|client; legacy Dockerfiles
  preserved as Dockerfile.legacy for reference but excluded from build
  context via .dockerignore.
- docker-compose.dev.yml + docker-compose.yml: build context now ".",
  dockerfile pointing to the root files.

Code adjustments forced by the move
- Every "from config|database|models|schemas|services|routers|middleware
  import ..." rewritten to its src.backend.* equivalent (50+ files
  including indented inline imports inside test bodies).
- src/backend/migrations/env.py: insert project root into sys.path so
  alembic can resolve src.backend.* imports regardless of cwd.
- src/backend/config.py: env_file ../../.env (was ../.env), upload_path
  resolves project root via parents[2].
- src/backend/tests/conftest.py + tests: import ... from src.backend.*
  instead of bare names; old per-directory pytest.ini files removed in
  favor of root pyproject.toml [tool.pytest.ini_options].
- .gitignore: uploads/ at root, src/frontend/flask_app/static/css/
  tailwind.css path; .dockerignore tightened.
- CLAUDE.md: rewrote sections "Layout del repository", "Comandi di
  Sviluppo", "Database & Migrations", "Test", "i18n", and all path
  references throughout the architecture sections.

Verified
- uv lock resolves 77 packages; uv sync --extra server --extra client
  --extra dev installs cleanly.
- uv run pytest: 171 passed, 4 pre-existing failures.
- uv run alembic -c src/backend/migrations/alembic.ini check loads
  config and metadata (errors only on the absent local MySQL).

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

src/backend/models/orm/task.py

@@ -0,0 +1,84 @@
+"""RecipeTask and RecipeSubtask models."""
+from typing import TYPE_CHECKING, Optional
+
+from sqlalchemy import (
+    DECIMAL, Enum, ForeignKey, Index, Integer, JSON, String, Text, UniqueConstraint,
+)
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from src.backend.database import Base
+
+if TYPE_CHECKING:
+    from src.backend.models.orm.recipe import RecipeVersion
+
+
+class RecipeTask(Base):
+    __tablename__ = "recipe_tasks"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    version_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("recipe_versions.id"), nullable=False
+    )
+    order_index: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    directive: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    file_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    file_type: Mapped[Optional[str]] = mapped_column(
+        Enum("image", "pdf", name="file_type_enum"), nullable=True
+    )
+    annotations_json: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
+
+    # Relationships
+    version: Mapped["RecipeVersion"] = relationship(back_populates="tasks")
+    subtasks: Mapped[list["RecipeSubtask"]] = relationship(
+        back_populates="task", cascade="all, delete-orphan", lazy="selectin"
+    )
+
+    __table_args__ = (
+        {"mysql_engine": "InnoDB", "mysql_charset": "utf8mb4"},
+    )
+
+    @property
+    def recipe_id(self) -> int | None:
+        """Shortcut: recipe_id via the version relationship."""
+        if self.version:
+            return self.version.recipe_id
+        return None
+
+    def __repr__(self) -> str:
+        return f"<RecipeTask #{self.order_index} '{self.title}'>"
+
+
+class RecipeSubtask(Base):
+    __tablename__ = "recipe_subtasks"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    task_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("recipe_tasks.id", ondelete="CASCADE"), nullable=False
+    )
+    marker_number: Mapped[int] = mapped_column(Integer, nullable=False)
+    description: Mapped[str] = mapped_column(String(500), nullable=False)
+    measurement_type: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+
+    # Tolerance values
+    nominal: Mapped[Optional[float]] = mapped_column(DECIMAL(12, 6), nullable=True)
+    utl: Mapped[Optional[float]] = mapped_column(DECIMAL(12, 6), nullable=True)  # Upper Tolerance Limit
+    uwl: Mapped[Optional[float]] = mapped_column(DECIMAL(12, 6), nullable=True)  # Upper Warning Limit
+    lwl: Mapped[Optional[float]] = mapped_column(DECIMAL(12, 6), nullable=True)  # Lower Warning Limit
+    ltl: Mapped[Optional[float]] = mapped_column(DECIMAL(12, 6), nullable=True)  # Lower Tolerance Limit
+
+    unit: Mapped[str] = mapped_column(String(20), nullable=False, default="mm")
+    image_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+
+    # Relationships
+    task: Mapped["RecipeTask"] = relationship(back_populates="subtasks")
+
+    __table_args__ = (
+        UniqueConstraint("task_id", "marker_number", name="uq_task_marker"),
+        Index("ix_subtask_task_id", "task_id"),
+        {"mysql_engine": "InnoDB", "mysql_charset": "utf8mb4"},
+    )
+
+    def __repr__(self) -> str:
+        return f"<RecipeSubtask #{self.marker_number} '{self.description}'>"