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/templates/reports/measurement_report.html

@@ -0,0 +1,75 @@
+{% extends "base_report.html" %}
+
+{% block report_title %}Measurement Report{% endblock %}
+
+{% block content %}
+<!-- Recipe info + filters -->
+<div class="info-box">
+  <span class="label">Recipe:</span> {{ recipe.code }} — {{ recipe.name }}
+  {% if filters_desc %}
+  <br>
+  <span class="label">Filters:</span> {{ filters_desc | join(' | ') }}
+  {% endif %}
+</div>
+
+<!-- Summary -->
+<div class="section">
+  <div class="section-title">Summary</div>
+  <div class="summary-grid">
+    <div class="summary-card">
+      <div class="number mono">{{ summary.total }}</div>
+      <div class="label">Total</div>
+    </div>
+    <div class="summary-card pass-bg">
+      <div class="number mono pass">{{ summary.pass_count }}</div>
+      <div class="label">Pass ({{ summary.pass_rate }}%)</div>
+    </div>
+    <div class="summary-card warning-bg">
+      <div class="number mono warning">{{ summary.warning_count }}</div>
+      <div class="label">Warning ({{ summary.warning_rate }}%)</div>
+    </div>
+    <div class="summary-card fail-bg">
+      <div class="number mono fail">{{ summary.fail_count }}</div>
+      <div class="label">Fail ({{ summary.fail_rate }}%)</div>
+    </div>
+  </div>
+</div>
+
+<!-- Measurements Table -->
+<div class="section">
+  <div class="section-title">Measurements ({{ n_measurements }})</div>
+  <table>
+    <thead>
+      <tr>
+        <th>#</th>
+        <th>Measurement Point</th>
+        <th>Value</th>
+        <th>Unit</th>
+        <th>Result</th>
+        <th>Date</th>
+        <th>Operator</th>
+        <th>Lot</th>
+        <th>Serial</th>
+      </tr>
+    </thead>
+    <tbody>
+      {% for row in rows %}
+      <tr class="{% if row.pass_fail == 'fail' %}fail-bg{% elif row.pass_fail == 'warning' %}warning-bg{% endif %}">
+        <td class="mono">{{ row.num }}</td>
+        <td>{{ row.subtask }}</td>
+        <td class="mono">{{ row.value }}</td>
+        <td>{{ row.unit }}</td>
+        <td>
+          <span class="{{ row.pass_fail }}">{{ row.pass_fail | upper }}</span>
+        </td>
+        <td class="mono">{{ row.measured_at }}</td>
+        <td>{{ row.operator }}</td>
+        <td>{{ row.lot_number }}</td>
+        <td>{{ row.serial_number }}</td>
+      </tr>
+      {% endfor %}
+    </tbody>
+  </table>
+</div>
+
+{% endblock %}