feat(auto-organize): improve exclusion handling and progress reporting

- Add auto_organize_exclusions to settings handler proxy keys
- Refactor model file service to handle exclusions relative to model roots
- Improve auto-organize progress reporting for empty operations
- Fix exclusion pattern matching to consider relative paths within model roots
- Ensure proper validation when no model roots are configured
- Add comprehensive cleanup reporting for empty auto-organize operations

static/css/components/modal/settings-modal.css

@@ -233,6 +233,11 @@
     resize: vertical;
 }
 
+.auto-organize-exclusions-input {
+    width: 100%;
+    box-sizing: border-box;
+}
+
 .priority-tags-input:focus {
     border-color: var(--lora-accent);
     outline: none;
@@ -261,6 +266,10 @@
     margin-bottom: 0;
 }
 
+.auto-organize-exclusions-item {
+    gap: var(--space-2);
+}
+
 .priority-tags-example {
     font-size: 0.85em;
     opacity: 0.8;