refactor: перенести сборку в проекты

- перенесены каноны и VitePress-конфиги в projects/<slug>

- добавлены корневой и проектные build.ts для сборки артефактов

- добавлены shared-библиотеки сборки в projects/_shared/lib

- обновлены CI, Dockerfile, package.json, gitignore и README

- удалена сборка frontend-агента

projects/_shared/lib/zip.ts

@@ -0,0 +1,136 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+type ZipEntry = {
+  name: string;
+  content: Buffer;
+};
+
+function collectFiles(dir: string, baseDir = dir, archiveRoot = path.basename(dir)): ZipEntry[] {
+  return fs
+    .readdirSync(dir, { withFileTypes: true })
+    .flatMap((entry) => {
+      const entryPath = path.join(dir, entry.name);
+
+      if (entry.isDirectory()) return collectFiles(entryPath, baseDir, archiveRoot);
+
+      const relativePath = path.relative(baseDir, entryPath).split(path.sep).join('/');
+
+      return [
+        {
+          name: `${archiveRoot}/${relativePath}`,
+          content: fs.readFileSync(entryPath),
+        },
+      ];
+    })
+    .sort((a, b) => a.name.localeCompare(b.name));
+}
+
+function createCrc32Table() {
+  return Array.from({ length: 256 }, (_, index) => {
+    let value = index;
+
+    for (let bit = 0; bit < 8; bit += 1) {
+      value = value & 1 ? 0xedb88320 ^ (value >>> 1) : value >>> 1;
+    }
+
+    return value >>> 0;
+  });
+}
+
+const crc32Table = createCrc32Table();
+
+function crc32(buffer: Buffer) {
+  let crc = 0xffffffff;
+
+  for (const byte of buffer) {
+    crc = crc32Table[(crc ^ byte) & 0xff] ^ (crc >>> 8);
+  }
+
+  return (crc ^ 0xffffffff) >>> 0;
+}
+
+function writeUInt16(value: number) {
+  const buffer = Buffer.alloc(2);
+  buffer.writeUInt16LE(value, 0);
+  return buffer;
+}
+
+function writeUInt32(value: number) {
+  const buffer = Buffer.alloc(4);
+  buffer.writeUInt32LE(value >>> 0, 0);
+  return buffer;
+}
+
+function createZip(entries: ZipEntry[]) {
+  const localParts: Buffer[] = [];
+  const centralParts: Buffer[] = [];
+  const dosTime = 0;
+  const dosDate = ((2026 - 1980) << 9) | (1 << 5) | 1;
+  let offset = 0;
+
+  for (const entry of entries) {
+    const fileName = Buffer.from(entry.name, 'utf8');
+    const checksum = crc32(entry.content);
+    const size = entry.content.length;
+
+    const localHeader = Buffer.concat([
+      writeUInt32(0x04034b50),
+      writeUInt16(20),
+      writeUInt16(0),
+      writeUInt16(0),
+      writeUInt16(dosTime),
+      writeUInt16(dosDate),
+      writeUInt32(checksum),
+      writeUInt32(size),
+      writeUInt32(size),
+      writeUInt16(fileName.length),
+      writeUInt16(0),
+      fileName,
+    ]);
+
+    localParts.push(localHeader, entry.content);
+
+    centralParts.push(Buffer.concat([
+      writeUInt32(0x02014b50),
+      writeUInt16(20),
+      writeUInt16(20),
+      writeUInt16(0),
+      writeUInt16(0),
+      writeUInt16(dosTime),
+      writeUInt16(dosDate),
+      writeUInt32(checksum),
+      writeUInt32(size),
+      writeUInt32(size),
+      writeUInt16(fileName.length),
+      writeUInt16(0),
+      writeUInt16(0),
+      writeUInt16(0),
+      writeUInt16(0),
+      writeUInt32(0),
+      writeUInt32(offset),
+      fileName,
+    ]));
+
+    offset += localHeader.length + size;
+  }
+
+  const centralDirectory = Buffer.concat(centralParts);
+  const endOfCentralDirectory = Buffer.concat([
+    writeUInt32(0x06054b50),
+    writeUInt16(0),
+    writeUInt16(0),
+    writeUInt16(entries.length),
+    writeUInt16(entries.length),
+    writeUInt32(centralDirectory.length),
+    writeUInt32(offset),
+    writeUInt16(0),
+  ]);
+
+  return Buffer.concat([...localParts, centralDirectory, endOfCentralDirectory]);
+}
+
+export function writeZipFromDirectory(sourceDir: string, zipPath: string, archiveRoot = path.basename(sourceDir)) {
+  fs.mkdirSync(path.dirname(zipPath), { recursive: true });
+  fs.writeFileSync(zipPath, createZip(collectFiles(sourceDir, sourceDir, archiveRoot)));
+}