feat(dashboard): rebuild SOC dashboard + fix ClickHouse SQL

Complete rewrite of the SOC dashboard using FastAPI + Jinja2 + htmx + Chart.js + Tailwind CSS.
Replaces the old React/Vite frontend with server-rendered templates.

Dashboard pages:
- Overview: KPIs, timeline chart, threat distribution, top IPs
- Detections: paginated/filterable anomaly table
- Scores: ml_all_scores with AE error & XGB prob columns
- Traffic: HTTP logs with method/host filters
- IP Investigation: full deep-dive (scores, features, HTTP logs, classify)
- Classification: SOC feedback form + history
- Features: AI + thesis feature stats
- Models: scoring stats + model metadata

API: 9 JSON endpoints with parameterized queries, sort whitelists

SQL fixes:
- 05_aggregation_tables: add deduplicate_merge_projection_mode
- 11_views: fix nested aggregate (argMax inside sum)
- 12_thesis_features: remove invalid 'let' bindings, fix groupArrayIf type

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

services/dashboard/Dockerfile.tests

@@ -1,10 +0,0 @@
-FROM python:3.11-slim
-WORKDIR /app
-COPY shared/python/ja4_common/ /app/shared/ja4_common/
-RUN pip install --no-cache-dir /app/shared/ja4_common/
-COPY services/dashboard/requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
-RUN pip install --no-cache-dir pytest pytest-mock httpx
-COPY services/dashboard/backend/ ./backend/
-COPY services/dashboard/backend/tests/ ./backend/tests/
-CMD ["pytest", "backend/tests/", "-v"]