Fix: CsI(Tl) non-linear response correction + detector calibration overhaul

Root cause of Am-241 misidentification: the Radiacode 103's CsI(Tl) crystal
shifts low-energy peaks upward (59.5 keV → 71.6 keV for Am-241) due to
non-proportional scintillation response. The model was trained on theoretical
peak positions and couldn't match the shifted real peaks.

Changes:
- Add inverse CsI(Tl) non-linear correction to inference pipeline
  (radiacode_monitor.py, web/config.py, test_detection.py)
  E_apparent = E_true * (1 + 0.37 * exp(-E_true/100))
  Corrects channel mapping so peaks appear at theoretical energies
- Fix energy calibration: DetectorConfig now uses E = 0.33 + 2.97*ch
  with 1023 channels, matching the real detector (was energy_min=20,
  skip_first_channel=True, different channel width)
- Add K-escape peaks for CsI(Tl) iodine X-ray escape (E - 28.5 keV)
- Add asymmetric peak shapes for low-energy tails (< 200 keV)
- Add log1p normalization in dataset and inference (replaces max-norm)
- Add background-subtracted training mode (subtract_background flag)
- Add low-signal augmentation (0.01-5 Bq activities, 30-300s durations)
- Update docker-compose.yml: batch_size=32, duration=30-300s,
  CSI_NONLINEAR_ALPHA/BETA env vars for detect and web
- Web dashboard: apply CsI correction to displayed spectra
- Various UI fixes (Chart.js width, zoom/pan, isotope lines)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/static/js/cps.js

@@ -41,10 +41,9 @@ function updateCpsChart(labels, values) {
         }]
     };
 
-    const existingMin = cpsChart?.scales.x?.min;
-    const existingMax = cpsChart?.scales.x?.max;
-    const xMin = existingMin ?? labels[0];
-    const xMax = existingMax ?? labels[labels.length - 1];
+    const panRange = cpsChart?._panRange;
+    const xMin = panRange ? panRange[0] : labels[0];
+    const xMax = panRange ? panRange[1] : labels[labels.length - 1];
     const options = {
         responsive: true,
         maintainAspectRatio: false,
@@ -114,10 +113,15 @@ function updateCpsChart(labels, values) {
     }
 }
 
-// Reset zoom
+// Reset zoom — restore full time range
 document.getElementById('reset-zoom-cps')?.addEventListener('click', () => {
     if (cpsChart) {
         cpsChart.resetZoom();
+        delete cpsChart._panRange;
+        const labels = cpsChart.data.labels;
+        cpsChart.options.scales.x.min = labels[0];
+        cpsChart.options.scales.x.max = labels[labels.length - 1];
+        cpsChart.update();
         document.getElementById('reset-zoom-cps').style.display = 'none';
     }
 });