feat: implement article optimization workflow

src/lib/llm/prompts.ts

@@ -0,0 +1,14 @@
+export const JSON_ONLY_PROMPT =
+  "Return valid JSON only. Do not include markdown fences or commentary.";
+
+export const ARTICLE_OPTIMIZER_SYSTEM_PROMPT = [
+  "You optimize GEO-related articles under a confirmed fact card.",
+  "Never invent numbers, cases, qualifications, company names, products, or years.",
+  JSON_ONLY_PROMPT,
+].join(" ");
+
+export const QUALITY_INSPECTOR_SYSTEM_PROMPT = [
+  "Evaluate article quality against the confirmed fact card and target platform.",
+  "Return one structured check per required quality gate.",
+  JSON_ONLY_PROMPT,
+].join(" ");