feat: Enhance configuration management and embedding capabilities

- Added JSON-based settings management in Config class for embedding and LLM configurations.
- Introduced methods to save and load settings from a JSON file.
- Updated BaseEmbedder and its subclasses to include max_tokens property for better token management.
- Enhanced chunking strategy to support recursive splitting of large symbols with improved overlap handling.
- Implemented comprehensive tests for recursive splitting and chunking behavior.
- Added CLI tools configuration management for better integration with external tools.
- Introduced a new command for compacting session memory into structured text for recovery.

ccw/src/templates/dashboard-css/31-api-settings.css

@@ -622,11 +622,110 @@ select.cli-input {
   align-items: center;
   justify-content: flex-end;
   gap: 0.75rem;
-  margin-top: 1rem;
-  padding-top: 1rem;
+  margin-top: 1.25rem;
+  padding-top: 1.25rem;
   border-top: 1px solid hsl(var(--border));
 }
 
+.modal-actions button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.5rem;
+  padding: 0.625rem 1.25rem;
+  font-size: 0.875rem;
+  font-weight: 500;
+  border-radius: 0.5rem;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  min-width: 5rem;
+}
+
+.modal-actions .btn-secondary {
+  background: transparent;
+  border: 1px solid hsl(var(--border));
+  color: hsl(var(--muted-foreground));
+}
+
+.modal-actions .btn-secondary:hover {
+  background: hsl(var(--muted));
+  color: hsl(var(--foreground));
+  border-color: hsl(var(--muted-foreground) / 0.3);
+}
+
+.modal-actions .btn-primary {
+  background: hsl(var(--primary));
+  border: 1px solid hsl(var(--primary));
+  color: hsl(var(--primary-foreground));
+}
+
+.modal-actions .btn-primary:hover {
+  background: hsl(var(--primary) / 0.9);
+  box-shadow: 0 2px 8px hsl(var(--primary) / 0.3);
+}
+
+.modal-actions .btn-primary:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+  box-shadow: none;
+}
+
+.modal-actions .btn-danger {
+  background: hsl(var(--destructive));
+  border: 1px solid hsl(var(--destructive));
+  color: hsl(var(--destructive-foreground));
+}
+
+.modal-actions .btn-danger:hover {
+  background: hsl(var(--destructive) / 0.9);
+  box-shadow: 0 2px 8px hsl(var(--destructive) / 0.3);
+}
+
+.modal-actions button i,
+.modal-actions button svg {
+  width: 1rem;
+  height: 1rem;
+  flex-shrink: 0;
+}
+
+/* Handle .btn class prefix */
+.modal-actions .btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.5rem;
+  padding: 0.625rem 1.25rem;
+  font-size: 0.875rem;
+  font-weight: 500;
+  border-radius: 0.5rem;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  min-width: 5rem;
+}
+
+.modal-actions .btn.btn-secondary {
+  background: transparent;
+  border: 1px solid hsl(var(--border));
+  color: hsl(var(--muted-foreground));
+}
+
+.modal-actions .btn.btn-secondary:hover {
+  background: hsl(var(--muted));
+  color: hsl(var(--foreground));
+  border-color: hsl(var(--muted-foreground) / 0.3);
+}
+
+.modal-actions .btn.btn-primary {
+  background: hsl(var(--primary));
+  border: 1px solid hsl(var(--primary));
+  color: hsl(var(--primary-foreground));
+}
+
+.modal-actions .btn.btn-primary:hover {
+  background: hsl(var(--primary) / 0.9);
+  box-shadow: 0 2px 8px hsl(var(--primary) / 0.3);
+}
+
 /* Button Icon */
 .btn-icon {
   display: inline-flex;
@@ -1916,4 +2015,84 @@ select.cli-input {
   .health-check-grid {
     grid-template-columns: 1fr;
   }
+}
+
+/* ===========================
+   Model Settings Modal - Endpoint Preview
+   =========================== */
+
+.endpoint-preview-section {
+  background: hsl(var(--muted) / 0.3);
+  border: 1px solid hsl(var(--border));
+  border-radius: 0.5rem;
+  padding: 1rem;
+  margin-bottom: 0.5rem;
+}
+
+.endpoint-preview-section h4 {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin: 0 0 0.75rem 0;
+  font-size: 0.875rem;
+  font-weight: 600;
+  color: hsl(var(--foreground));
+}
+
+.endpoint-preview-section h4 i {
+  width: 16px;
+  height: 16px;
+  color: hsl(var(--primary));
+}
+
+.endpoint-preview-box {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.625rem 0.75rem;
+  background: hsl(var(--background));
+  border: 1px solid hsl(var(--border));
+  border-radius: 0.375rem;
+  margin-bottom: 1rem;
+}
+
+.endpoint-preview-box code {
+  flex: 1;
+  font-family: 'SF Mono', 'Consolas', 'Liberation Mono', monospace;
+  font-size: 0.8125rem;
+  color: hsl(var(--primary));
+  word-break: break-all;
+}
+
+.endpoint-preview-box .btn-icon-sm {
+  flex-shrink: 0;
+}
+
+/* Form Section within Modal */
+.form-section {
+  margin-bottom: 1.25rem;
+}
+
+.form-section h4 {
+  margin: 0 0 0.75rem 0;
+  font-size: 0.8125rem;
+  font-weight: 600;
+  color: hsl(var(--muted-foreground));
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+.form-section:last-of-type {
+  margin-bottom: 0;
+}
+
+/* Capabilities Checkboxes */
+.capabilities-checkboxes {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.75rem 1.5rem;
+}
+
+.capabilities-checkboxes .checkbox-label {
+  font-size: 0.875rem;
 }