Add TypeScript theme generator for doki-master-theme palettes

Generates one Gitea-compatible CSS theme file per doki-master-theme
definition (88 themes). Each file contains a gitea-theme-meta-info
block and a :root block with the full set of CSS custom properties
derived from the character's colour palette.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

generate.ts

@@ -0,0 +1,53 @@
+import { readdir, writeFile, mkdir } from 'node:fs/promises';
+import { join, resolve } from 'node:path';
+import { loadTheme } from './src/palette.js';
+import { buildVariables } from './src/themeBuilder.js';
+import { renderThemeCSS } from './src/cssWriter.js';
+
+const DOKI_REPO = resolve(process.env['DOKI_REPO'] ?? './doki-master-theme');
+const OUTPUT_DIR = resolve(process.env['OUTPUT_DIR'] ?? './output');
+
+async function findDefinitionFiles(dir: string): Promise<string[]> {
+  const entries = await readdir(dir, { recursive: true });
+  return entries
+    .filter((f) => f.endsWith('.master.definition.json'))
+    .map((f) => join(dir, f));
+}
+
+async function main(): Promise<void> {
+  await mkdir(OUTPUT_DIR, { recursive: true });
+
+  const definitionsDir = join(DOKI_REPO, 'definitions');
+  const definitionFiles = await findDefinitionFiles(definitionsDir);
+
+  if (definitionFiles.length === 0) {
+    console.error(`No definition files found in ${definitionsDir}`);
+    console.error('Make sure the doki-master-theme submodule is initialised:');
+    console.error('  git submodule update --init');
+    process.exit(1);
+  }
+
+  let success = 0;
+  let errors = 0;
+
+  for (const defPath of definitionFiles) {
+    try {
+      const theme = loadTheme(defPath, DOKI_REPO);
+      const variables = buildVariables(theme);
+      const css = renderThemeCSS(theme, variables);
+
+      const outPath = join(OUTPUT_DIR, `theme-${theme.internalName}.css`);
+      await writeFile(outPath, css, 'utf8');
+
+      console.log(`✓ ${theme.internalName}`);
+      success++;
+    } catch (err) {
+      console.error(`✗ ${defPath}: ${err}`);
+      errors++;
+    }
+  }
+
+  console.log(`\nGenerated ${success} theme${success !== 1 ? 's' : ''}. Errors: ${errors}.`);
+}
+
+main();