refactor(backend)!: separate algorithm and data layers

Reorganize algorithm packages by business responsibility, move orchestration into services, and keep database access behind pooled repositories.

Harden analysis API validation, remove unsafe legacy simulation endpoints, and add regression and architecture boundary coverage.

BREAKING CHANGE: legacy algorithm module paths and obsolete simulation endpoints are removed.

app/algorithms/burst_detection/__init__.py

@@ -1,3 +1,3 @@
-from app.algorithms.burst_detection.burst_detector import BurstDetector
+from app.algorithms.burst_detection.pressure_anomaly import PressureAnomalyDetector
 
-__all__ = ["BurstDetector"]
+__all__ = ["PressureAnomalyDetector"]

app/algorithms/burst_detection/pressure_anomaly.py

@@ -17,7 +17,7 @@ PressureDataInput = (
 IGNORED_OBSERVATION_COLUMNS = {"time", "timestamp", "datetime", "date"}
 
 
-class BurstDetector:
+class PressureAnomalyDetector:
     """FFT + IsolationForest based burst detection for daily aligned pressure data."""
 
     def __init__(