ui: parametri user-friendly (tipo/simmetria/scala/precisione)

Nascosti i parametri tecnici (num_features, weak/strong_grad, spread,
pyramid) incomprensibili per operatori. Sostituiti da scelte semantiche:

- Tipo modello: intero | parziale
- Simmetria: nessuna | bilaterale (180) | rotazionale 3/4/6/8x
- Variazione scala: fissa | 10% | 25% | 50%
- Precisione: veloce 10 | normale 5 | preciso 2
- Score minimo: slider
- Max match: input

Server: nuovo endpoint POST /match_simple. Deriva tecnici via
_simple_to_technical(roi) che analizza la ROI:
- weak/strong_grad da percentili
- num_features da densita edge x tipo
- pyramid_levels da min(h,w) ROI
- spread_radius proporzionale

Frontend: select + slider, sezione Avanzate collassabile per override.

Test rings_and_nuts preset intero/nessuna/medio/normale: 3/3 ruote in 2.14s

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pm2d/web/static/style.css

@@ -56,18 +56,41 @@ canvas {
   margin-top: 6px; font-size: 12px; color: #aaa;
 }
 
-#params-form {
-  display: grid; grid-template-columns: 1fr 100px; gap: 4px 8px;
+.field {
+  margin-bottom: 10px;
 }
-#params-form label {
-  font-size: 12px; display: flex; align-items: center;
+.field label {
+  display: block; font-size: 12px; color: #b0b0b0;
+  margin-bottom: 3px;
 }
-#params-form input {
+.field select, .field input {
+  width: 100%; background: #2a2a2a; color: #dcdcdc;
+  border: 1px solid #444; padding: 5px 6px; border-radius: 3px;
+  font-size: 12px;
+}
+.field input[type="range"] {
+  padding: 0; height: 26px;
+}
+.field select:focus, .field input:focus {
+  outline: 1px solid #00c8ff;
+}
+
+#v-score { color: #00c8ff; font-weight: bold; }
+
+details { margin-top: 10px; font-size: 12px; }
+details summary {
+  cursor: pointer; padding: 4px 0; color: #00c8ff;
+}
+#adv-form {
+  display: grid; grid-template-columns: 1fr 80px; gap: 3px 6px;
+  margin-top: 4px;
+}
+#adv-form label { font-size: 11px; color: #999; }
+#adv-form input {
   background: #2a2a2a; color: #dcdcdc; border: 1px solid #444;
-  padding: 4px 6px; border-radius: 3px; font-size: 12px;
+  padding: 3px 5px; border-radius: 3px; font-size: 11px;
   width: 100%;
 }
-#params-form input:focus { outline: 1px solid #00c8ff; }
 
 .kv {
   display: flex; justify-content: space-between;