feat: parse schema for syntax validation only in database-only mode

In database-only mode, parse the schema migrations to validate syntax
and collect them for the database connection, but skip updating the
catalog. The database will be the source of truth for schema information.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/compiler/compile.go

@@ -41,11 +41,19 @@ func (c *Compiler) parseCatalog(schemas []string) error {
 		contents := migrations.RemoveRollbackStatements(string(blob))
 		c.schema = append(c.schema, contents)
 
+		// In database-only mode, we parse the schema to validate syntax
+		// but don't update the catalog - the database will be the source of truth
 		stmts, err := c.parser.Parse(strings.NewReader(contents))
 		if err != nil {
 			merr.Add(filename, contents, 0, err)
 			continue
 		}
+
+		// Skip catalog updates in database-only mode
+		if c.databaseOnlyMode {
+			continue
+		}
+
 		for i := range stmts {
 			if err := c.catalog.Update(stmts[i], c); err != nil {
 				merr.Add(filename, contents, stmts[i].Pos(), err)