feat: multi-format env var editor for deployment config

Replace simple key-value rows with EnvEditor component that supports
editing variables as Table, Properties, YAML, or .env format.
Switching views converts data seamlessly. Includes file import
(drag-and-drop .properties/.yaml/.env) with auto-detect and merge.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/EnvEditor.module.css

@@ -0,0 +1,91 @@
+.wrap {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.toolbar {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.actions {
+  margin-left: auto;
+  display: flex;
+  gap: 6px;
+}
+
+.tableBody {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.row {
+  display: flex;
+  gap: 8px;
+  align-items: center;
+}
+
+.rowKey {
+  width: 220px;
+  flex-shrink: 0;
+}
+
+.rowValue {
+  flex: 1;
+}
+
+.deleteBtn {
+  background: none;
+  border: none;
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 16px;
+  padding: 4px;
+  border-radius: var(--radius-sm);
+  transition: color 0.1s;
+}
+
+.deleteBtn:hover {
+  color: var(--error);
+}
+
+.deleteBtn:disabled {
+  opacity: 0.3;
+  cursor: default;
+}
+
+.textEditor {
+  width: 100%;
+  min-height: 180px;
+  padding: 10px 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg-raised);
+  color: var(--text-primary);
+  font-family: var(--font-mono);
+  font-size: 12px;
+  line-height: 1.6;
+  resize: vertical;
+  outline: none;
+  transition: border-color 0.15s, box-shadow 0.15s;
+  tab-size: 2;
+}
+
+.textEditor:focus {
+  border-color: var(--amber);
+  box-shadow: 0 0 0 3px var(--amber-bg);
+}
+
+.importZone {
+  margin-top: 4px;
+}
+
+.empty {
+  padding: 24px;
+  text-align: center;
+  color: var(--text-faint);
+  font-size: 12px;
+}