Move seed.sql out of migrations and add SEO structured data

- Relocate seed.sql to scripts/ so wrangler d1 migrations apply
  doesn't treat it as a migration; update package.json, setup.mjs,
  README, and all AGENTS.md references.
- Add src/lib/schema-org.ts builders (LocalBusiness, FAQPage,
  BlogPosting, BreadcrumbList) and emit JSON-LD via Base.astro.
- Add lastmod to sitemap entries.
- Set real site domain, worker route, and D1/KV ids.
- Improve image loading hints and heading semantics across site
  components; switch BlogIndex to client:idle.

astro.config.mjs

@@ -3,18 +3,17 @@ import cloudflare from "@astrojs/cloudflare";
 import react from "@astrojs/react";
 
 export default defineConfig({
+	integrations: [react()],
+	// ⚠️ 上線前改咗呢個做你嘅真域名（sitemap、canonical、OG 全部靠佢）
+	site: "https://solar.develop-cat.com",
 
-  integrations: [react()],
-  // ⚠️ 上線前改咗呢個做你嘅真域名（sitemap、canonical、OG 全部靠佢）
-  site: "https://example.com",
+	output: "static",
 
-  output: "static",
-
-  adapter: cloudflare({
-    platformProxy: {
-      enabled: true,
-      // 本機 astro dev 時讀 wrangler.jsonc 嘅 bindings
-      configPath: "./wrangler.jsonc",
-    },
-  }),
+	adapter: cloudflare({
+		platformProxy: {
+			enabled: true,
+			// 本機 astro dev 時讀 wrangler.jsonc 嘅 bindings
+			configPath: "./wrangler.jsonc",
+		},
+	}),
 });