refactor: centralize section config — remove all hardcoded section lists

- New packages/config/src/sections.ts: SECTIONS, SECTIONS_BY_ID, SECTION_IDS
  (no Node.js built-in imports — safe for client components)
- New package entrypoint: @mcpedia/config/sections (exports only sections.ts)
- Client components import from @mcpedia/config/sections (no node:fs in bundle)
- Server components import from @mcpedia/config (has env/fs, server-only)
- Removed hardcoded SECTIONS/SECTION_LABEL/SECTION_ICON from:
  - [section]/page.tsx (was inline array)
  - [section]/[...slug]/page.tsx (was hardcoded Record maps)
  - Sidebar.tsx (was inline array)
  - layout.tsx (was inline array)
  - page.tsx (was inline array)
  - create/page.tsx (was inline array via SECTIONS import)
- Added @mcpedia/config/sections entrypoint to package.json exports

packages/config/src/index.ts

@@ -35,7 +35,6 @@ export const CONTENT_ROOT =
   process.env.CONTENT_ROOT ?? resolve(REPO_ROOT, "content");
 
 export const DATABASE_URL = process.env.DATABASE_URL ?? "";
-
 export const EMBED_BASE_URL = process.env.EMBED_BASE_URL ?? "";
 export const EMBED_API_KEY = process.env.EMBED_API_KEY ?? "";
 export const EMBED_MODEL = process.env.EMBED_MODEL ?? "";
@@ -43,20 +42,17 @@ export const EMBED_MODEL = process.env.EMBED_MODEL ?? "";
 // Phase 3: Redis + BullMQ (shared imrnes Redis, no auth by default).
 export const REDIS_URL = process.env.REDIS_URL ?? "redis://100.121.180.82:6379";
 export const REDIS_PASSWORD = process.env.REDIS_PASSWORD ?? "";
-// BullMQ key prefix to namespace jobs on the shared Redis instance.
 export const QUEUE_PREFIX = process.env.QUEUE_PREFIX ?? "mcpedia";
 
-// Phase 4: git-sync webhook shared secret. The API /hooks/* endpoints require
-// this header (x-webhook-secret) to match, so an open port can't trigger reindex.
+// Phase 4: git-sync webhook shared secret.
 export const WEBHOOK_SECRET = process.env.WEBHOOK_SECRET ?? "";
 
-// Phase 11: Admin password for web-based CRUD (create/update/delete documents).
-// Used by the Web UI login flow. MCP/API writes still use WEBHOOK_SECRET.
+// Phase 11: Admin password for web-based CRUD.
 export const ADMIN_PASSWORD = process.env.ADMIN_PASSWORD ?? "";
 
-// NOTE: we deliberately do NOT throw here if DATABASE_URL is empty. Throwing at
-// import time breaks `next build` (SSG data collection imports config before
-// any .env is present) and any runtime-injected env (containers/systemd set env
-// at process start, after module load). The DB driver (postgres.js) connects
-// lazily on first query, so a missing DATABASE_URL surfaces as a clear connect
-// error at runtime — not a cryptic build failure.
+// Phase 14: Section registry — re-exported from a Node-free module so client
+// components can safely import SECTIONS without pulling in node:fs.
+export { SECTIONS, SECTIONS_BY_ID, SECTION_IDS, type SectionConfig } from "./sections";
+
+// NOTE: we deliberately do NOT throw here if DATABASE_URL is empty.
+// Throwing at import time breaks `next build` SSG and any runtime-injected env.

packages/config/src/sections.ts

@@ -0,0 +1,44 @@
+/**
+ * Section registry — defines all content sections for the UI.
+ * This file is intentionally free of Node.js built-in imports (no fs/path)
+ * so it can be safely imported by client components.
+ *
+ * Adding a new section is as simple as adding an entry here + creating a
+ * `content/<id>/` directory with markdown files. No UI code changes needed.
+ */
+export interface SectionConfig {
+  id: string;
+  label: string;
+  icon: string;
+  desc: string;
+}
+
+export const SECTIONS: SectionConfig[] = [
+  {
+    id: "docs",
+    label: "Documentation",
+    icon: "📄",
+    desc: "Setup guides, API references, and protocol specs.",
+  },
+  {
+    id: "writeups",
+    label: "Writeups",
+    icon: "📝",
+    desc: "Post-mortems, debugging stories, and case studies.",
+  },
+  {
+    id: "research",
+    label: "Research",
+    icon: "🔬",
+    desc: "Deep-dive analysis, architecture notes, and experiments.",
+  },
+  {
+    id: "notes",
+    label: "Notes",
+    icon: "📌",
+    desc: "Quick references, patterns, and gotchas.",
+  },
+];
+
+export const SECTIONS_BY_ID = new Map(SECTIONS.map((s) => [s.id, s]));
+export const SECTION_IDS = SECTIONS.map((s) => s.id);