Add Data Explorer tab for database browsing under API Connections

Introduces a new "Data Explorer" tab under API Generation & Connections
that provides a DBeaver-like database management experience. Features a
three-panel layout with database API selector, schema/table tree navigator,
and read-only data grid with pagination, sorting, filtering, and search.

- New standalone components: DfDataExplorerComponent, DfDbSelectorComponent,
  DfSchemaTreeComponent, DfDataGridComponent
- DataExplorerService for lazy API calls (services, _schema, _table)
- Performance-optimized: no data loaded until user explicitly selects it
- Server-side pagination (50 rows per page) to keep browser responsive
- Full i18n support with dataExplorer translation scope
- Matches existing DreamFactory UI theme and patterns

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: thekevinm

dist/1064.51f76a90b9f6bf10.js

@@ -0,0 +1,25 @@
+{
+  "title": "Data Explorer",
+  "selectDatabase": "Select a database API",
+  "selectTable": "Select a table to view data",
+  "noDatabases": "No database APIs configured",
+  "noDatabasesHint": "Create a database API connection first to explore your data.",
+  "noTables": "No tables found",
+  "noTablesHint": "This database has no accessible tables.",
+  "noData": "No records found",
+  "noDataHint": "This table is empty.",
+  "loading": "Loading...",
+  "loadingSchema": "Loading schema...",
+  "loadingData": "Loading data...",
+  "errorLoading": "Error loading data",
+  "retry": "Retry",
+  "tables": "Tables",
+  "showing": "Showing",
+  "of": "of",
+  "records": "records",
+  "searchTables": "Search tables...",
+  "database": "Database",
+  "table": "Table",
+  "readOnly": "Read-only",
+  "rowsPerPage": "Rows per page"
+}

dist/1212.7583676fba10ff85.js

@@ -245,6 +245,10 @@
       "api-docs": {
         "nav": "API Docs",
         "header": "{{nav.api-connections.api-docs.nav}}"
+      },
+      "data-explorer": {
+        "nav": "Data Explorer",
+        "header": "{{nav.api-connections.data-explorer.nav}}"
       }
     },
     "api-security": {