Initial commit: Port Nimara CRM (Layers 0-4)

Full CRM rebuild with Next.js 15, TypeScript, Tailwind, Drizzle ORM,
PostgreSQL, Redis, BullMQ, MinIO, and Socket.io. Includes 461 source
files covering clients, berths, interests/pipeline, documents/EOI,
expenses/invoices, email, notifications, dashboard, admin, and
client portal. CI/CD via Gitea Actions with Docker builds.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/constants/file-validation.ts

@@ -0,0 +1,37 @@
+export const ALLOWED_MIME_TYPES = new Set<string>([
+  'image/jpeg',
+  'image/png',
+  'image/gif',
+  'image/webp',
+  'application/pdf',
+  'application/msword',
+  'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+  'application/vnd.ms-excel',
+  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+  'text/plain',
+  'text/csv',
+]);
+
+export const MIME_TO_EXT: Record<string, string> = {
+  'image/jpeg': 'jpg',
+  'image/png': 'png',
+  'image/gif': 'gif',
+  'image/webp': 'webp',
+  'application/pdf': 'pdf',
+  'application/msword': 'doc',
+  'application/vnd.openxmlformats-officedocument.wordprocessingml.document': 'docx',
+  'application/vnd.ms-excel': 'xls',
+  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': 'xlsx',
+  'text/plain': 'txt',
+  'text/csv': 'csv',
+};
+
+export const MAX_FILE_SIZE = 52_428_800; // 50MB
+
+export const PREVIEWABLE_MIMES = new Set<string>([
+  'image/jpeg',
+  'image/png',
+  'image/gif',
+  'image/webp',
+  'application/pdf',
+]);