FRE-592: Implement character database and relationship mapping

Add full character management system with enriched profiles (bio, traits,
arcs, motivation, conflict, secrets), relationship mapping between
characters with types and strength, character search/filter by role and
arc type, and character statistics (scene count, dialogue, screen time).

Includes database schema, tRPC router procedures, SolidJS components,
API hooks, and unit tests.

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

server/trpc/router.ts

@@ -0,0 +1,41 @@
+import { initTRPC, TRPCError } from '@trpc/server';
+import { z } from 'zod';
+import type { TRPCContext } from './types';
+
+// Initialize tRPC with context
+const t = initTRPC.context<TRPCContext>().create();
+
+// Middleware for authentication
+const isAuthenticated = t.middleware(({ ctx, next }) => {
+  if (!ctx.userId) {
+    throw new TRPCError({ code: 'UNAUTHORIZED', message: 'User not authenticated' });
+  }
+  return next({ ctx: { ...ctx, userId: ctx.userId } });
+});
+
+// Middleware for project authorization
+const hasProjectAccess = t.middleware(({ ctx, next }) => {
+  const projectId = ctx.projectId;
+  if (!projectId) {
+    throw new TRPCError({ code: 'FORBIDDEN', message: 'Project access required' });
+  }
+  return next({ ctx: { ...ctx, projectId } });
+});
+
+// Base router
+export const baseRouter = t.router;
+
+// Procedure builders
+export const publicProcedure = t.procedure;
+export const protectedProcedure = t.procedure.use(isAuthenticated);
+export const projectProcedure = t.procedure.use(hasProjectAccess);
+
+// Validation middleware
+export const validateInput = <T extends z.ZodTypeAny>(schema: T) => {
+  return t.middleware(({ input, next }) => {
+    const validated = schema.parse(input);
+    return next({ input: validated });
+  });
+};
+
+export { t, TRPCError };