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.

src/components/site/Faq.tsx

@@ -1,4 +1,4 @@
-import { Accordion, Box, Text } from "@chakra-ui/react";
+import { Accordion, Box, Heading, Text } from "@chakra-ui/react";
 import { Plus } from "lucide-react";
 import type { ContentItem } from "../../db/schema";
 import { Section } from "./Section";
@@ -23,14 +23,16 @@ export function Faq({ items }: { items: ContentItem[] }) {
               borderColor="border.subtle"
               _last={{ borderBottomWidth: "1px" }}
             >
-              <Accordion.ItemTrigger py="6" px="0" _hover={{ bg: "transparent" }}>
-                <Text flex="1" textAlign="start" fontFamily="heading" fontWeight="700" color="ink" fontSize={{ base: "md", md: "lg" }}>
-                  {item.title}
-                </Text>
-                <Accordion.ItemIndicator color="brand.700" _open={{ transform: "rotate(45deg)" }}>
-                  <Plus size={18} />
-                </Accordion.ItemIndicator>
-              </Accordion.ItemTrigger>
+              <Heading as="h3" m="0" w="full" fontWeight="normal">
+                <Accordion.ItemTrigger py="6" px="0" w="full" _hover={{ bg: "transparent" }}>
+                  <Text flex="1" textAlign="start" fontFamily="heading" fontWeight="700" color="ink" fontSize={{ base: "md", md: "lg" }}>
+                    {item.title}
+                  </Text>
+                  <Accordion.ItemIndicator color="brand.700" _open={{ transform: "rotate(45deg)" }}>
+                    <Plus size={18} />
+                  </Accordion.ItemIndicator>
+                </Accordion.ItemTrigger>
+              </Heading>
               <Accordion.ItemContent>
                 <Accordion.ItemBody px="0" pb="7" pt="0" color="fg.muted" fontSize="sm" lineHeight="1.9" maxW="2xl">
                   {item.description}