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/api/user.py

@@ -0,0 +1,70 @@
+"""Pydantic schemas for User operations."""
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class UserCreate(BaseModel):
+    """Schema for creating a new user."""
+    username: str = Field(..., min_length=3, max_length=100)
+    password: str = Field(..., min_length=6, max_length=128)
+    email: Optional[str] = Field(None, max_length=255)
+    display_name: str = Field(..., min_length=1, max_length=255)
+    roles: list[str] = Field(default_factory=list)
+    is_admin: bool = False
+    language_pref: str = Field("it", pattern="^(it|en)$")
+    theme_pref: str = Field("light", pattern="^(light|dark)$")
+
+
+class UserUpdate(BaseModel):
+    """Schema for updating a user (admin)."""
+    email: Optional[str] = Field(None, max_length=255)
+    display_name: Optional[str] = Field(None, min_length=1, max_length=255)
+    roles: Optional[list[str]] = None
+    is_admin: Optional[bool] = None
+    active: Optional[bool] = None
+    language_pref: Optional[str] = Field(None, pattern="^(it|en)$")
+    theme_pref: Optional[str] = Field(None, pattern="^(light|dark)$")
+
+
+class UserProfileUpdate(BaseModel):
+    """Schema for user self-update (profile)."""
+    display_name: Optional[str] = Field(None, min_length=1, max_length=255)
+    language_pref: Optional[str] = Field(None, pattern="^(it|en)$")
+    theme_pref: Optional[str] = Field(None, pattern="^(light|dark)$")
+
+
+class UserResponse(BaseModel):
+    """Schema for user response."""
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    username: str
+    email: Optional[str] = None
+    display_name: str
+    roles: list[str]
+    is_admin: bool
+    language_pref: str
+    theme_pref: str
+    active: bool
+    created_at: datetime
+    last_login: Optional[datetime] = None
+
+
+class UserPasswordChange(BaseModel):
+    """Schema for changing user password (admin only)."""
+    password: str = Field(..., min_length=6, max_length=128)
+
+
+class LoginRequest(BaseModel):
+    """Schema for login request."""
+    username: str
+    password: str
+
+
+class LoginResponse(BaseModel):
+    """Schema for login response."""
+    user: UserResponse
+    api_key: str
+    message: str = "Login successful"