flatten monorepo, migrate off Vercel

- Remove penfield (split to own repo on Forgejo)
- Move www/ contents to root, rename to wynne.rs
- Swap @astrojs/vercel for @astrojs/node, upgrade to Astro 6
- Remove auth-astro/GitHub OAuth (TinyAuth at proxy layer)
- Remove Vercel deploy webhook
- Switch to local SQLite DB (drop Turso)
- Update generate-stats.js for new build output paths

src/lib/txt.ts

@@ -0,0 +1,45 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import yaml from 'js-yaml';
+import { sortEntries } from './format';
+
+export interface TxtFile {
+  name: string;
+  date: Date;
+  description?: string;
+}
+
+export interface TxtConfig {
+  descriptions?: Record<string, string>;
+  dates?: Record<string, string>;
+}
+
+export function getTxtDir(): string {
+  return path.join(process.cwd(), 'public');
+}
+
+export function loadTxtConfig(): TxtConfig {
+  const configPath = path.join(getTxtDir(), 'config.yaml');
+  return fs.existsSync(configPath)
+    ? yaml.load(fs.readFileSync(configPath, 'utf8')) as TxtConfig
+    : {};
+}
+
+export function getTxtFiles(): TxtFile[] {
+  const txtDir = getTxtDir();
+  if (!fs.existsSync(txtDir)) return [];
+
+  const config = loadTxtConfig();
+  const descriptions = config.descriptions || {};
+  const dates = config.dates || {};
+
+  const files = fs.readdirSync(txtDir)
+    .filter(file => file.endsWith('.txt'))
+    .map(name => ({
+      name,
+      date: dates[name] ? new Date(dates[name]) : new Date(0),
+      description: descriptions[name],
+    }));
+  return sortEntries(files);
+}
+