feat(ui): strategy config form and backend endpoint

static/js/app.js

@@ -121,13 +121,50 @@ function setupEventListeners() {
         }
     });
     
-    // Form submissions
+    // Strategy config form submission (real backend call)
+    const strategyForm = document.getElementById('strategy-config-form');
+    if (strategyForm) {
+        strategyForm.addEventListener('submit', function(e) {
+            e.preventDefault();
+            const payload = {
+                name: document.getElementById('strategy-name').value,
+                type: document.getElementById('strategy-type').value,
+                initialCapital: Number(document.getElementById('initial-capital').value),
+                entryLookback: Number(document.getElementById('entry-lookback').value),
+                exitLookback: Number(document.getElementById('exit-lookback').value),
+                riskPerTrade: Number(document.getElementById('risk-per-trade').value),
+                maxPositions: Number(document.getElementById('max-positions').value),
+                notes: document.getElementById('strategy-notes').value,
+            };
+            fetch('/api/strategy-config', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify(payload),
+            })
+                .then(res => res.json())
+                .then(data => {
+                    if (data.status === 'ok') {
+                        showToast('Strategy configuration saved', 'success');
+                    } else {
+                        showToast('Failed to save configuration', 'danger');
+                    }
+                })
+                .catch(err => {
+                    console.error('Error saving strategy config', err);
+                    showToast('Error saving configuration', 'danger');
+                });
+        });
+    }
+
+    // Generic form submissions (fallback)
     const forms = document.querySelectorAll('form');
     forms.forEach(form => {
-        form.addEventListener('submit', function(e) {
-            e.preventDefault();
-            showToast('Settings saved successfully', 'success');
-        });
+        if (form.id !== 'strategy-config-form') {
+            form.addEventListener('submit', function(e) {
+                e.preventDefault();
+                showToast('Settings saved successfully', 'success');
+            });
+        }
     });
     
     // Toggle buttons