FRE-594: Implement revision tracking and version history system

Add complete revision tracking system for scripts with:
- Database schema for revisions and revision_changes tables
- Diff engine with color-coded change types (addition/deletion/modification)
- tRPC router with 14 endpoints (create/list/compare/rollback/branch/merge)
- SolidJS components: RevisionTimeline, DiffViewer, RevisionReview
- Unit tests for diff engine and router

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/trpc/index.ts

@@ -1,12 +1,15 @@
-import { initHTTPServer } from '@trpc/server/adapters/http';
+import { initHTTPServer } from '@trpc/server/adapters/node-http';
 import { projectRouter } from './project-router';
+import { revisionsRouter } from './revisions-router';
 import type { TRPCContext } from './types';
 import type { TRPCError } from '@trpc/server';
+import { t } from './router';
 
 // App router combining all routers
-export const appRouter = {
+export const appRouter = t.router({
   project: projectRouter,
-};
+  revisions: revisionsRouter,
+});
 
 export type AppRouter = typeof appRouter;