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/isotope_lines.js

@@ -48,7 +48,7 @@ const ISOTOPE_LINES = [
 ];
 
 // Filtrer les lignes dans la plage visible du détecteur (30-3050 keV pour Radiacode 103)
-const VISIBLE_LINES = ISOTOPE_LINES.filter(l => l.energy_keV >= 30 && l.energy_keV <= 3050);
+const VISIBLE_LINES = ISOTOPE_LINES.filter(l => l.energy_keV >= 30 && l.energy_keV <= 3000);
 
 // Global crosshair plugin — vertical dashed line on hover for all charts
 const CrosshairPlugin = {
@@ -72,6 +72,50 @@ const CrosshairPlugin = {
 };
 Chart.register(CrosshairPlugin);
 
+// Auto-scale Y axis to visible X range
+const AutoScaleYPlugin = {
+    id: 'autoScaleY',
+    beforeUpdate(chart) {
+        const xScale = chart.scales?.x;
+        const yScale = chart.scales?.y;
+        if (!xScale || !yScale || xScale.type !== 'linear') return;
+
+        const xMin = xScale.min;
+        const xMax = xScale.max;
+        if (xMin == null || xMax == null) return;
+
+        let yMin = Infinity;
+        let yMax = -Infinity;
+        let count = 0;
+
+        chart.data.datasets.forEach(ds => {
+            for (const pt of ds.data) {
+                const x = Array.isArray(pt) ? pt[0] : pt.x;
+                const y = Array.isArray(pt) ? pt[1] : pt.y;
+                if (x === undefined || y === undefined) continue;
+                if (x >= xMin && x <= xMax) {
+                    if (y > 0 && y < yMin) yMin = y;
+                    if (y > yMax) yMax = y;
+                    count++;
+                }
+            }
+        });
+
+        if (count === 0 || yMin === Infinity) return;
+
+        const isLog = yScale.type === 'logarithmic';
+        if (isLog) {
+            chart.options.scales.y.min = Math.max(0.5, yMin * 0.7);
+            chart.options.scales.y.max = yMax * 1.5;
+        } else {
+            const padding = (yMax - yMin) * 0.05 || 1;
+            chart.options.scales.y.min = Math.max(0, yMin - padding);
+            chart.options.scales.y.max = yMax + padding;
+        }
+    }
+};
+Chart.register(AutoScaleYPlugin);
+
 // Couleurs par catégorie d'isotope
 function isotopeLineColor(isotope) {
     if (["K-40", "Bi-214", "Pb-214", "Ra-226"].includes(isotope)) return "rgba(255,152,0,0.5)";    // Uranium chain - orange