fix: parse JSON string values from MariaDB in org_config loader

MariaDB returns JSON columns as strings via mysql2 driver. Added
parseJsonValue() to handle both string and object values. Fixes
config not loading on production (always showing defaults).

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

tests/unit/config.test.ts

@@ -15,6 +15,19 @@ describe('config', () => {
 		expect(config.locale.language).toBe('en');
 	});
 
+	it('handles JSON string values from MariaDB', () => {
+		const rows = [
+			{ key: 'branding', value: '{"primaryColor":"#ea580c","accentColor":"#0d9488","logoUrl":""}' },
+			{ key: 'org_info', value: '{"name":"Sunny Paws Rescue","city":"Austin","state":"TX"}' },
+			{ key: 'setup_complete', value: 'true' }
+		];
+
+		const config = parseOrgConfig(rows);
+		expect(config.branding.primaryColor).toBe('#ea580c');
+		expect(config.orgInfo.name).toBe('Sunny Paws Rescue');
+		expect(config.setupComplete).toBe(true);
+	});
+
 	it('provides defaults for missing keys', () => {
 		const config = parseOrgConfig([]);
 		expect(config.branding.primaryColor).toBe('#0d9488');