feat: admin set password for users + fix dashboard cache error

Admin Set Password:
- New setPassword adminProcedure in user router (Argon2 hashing)
- Audit log: "Password reset by admin" (no password value logged)
- UI: per-user "Password" button with key icon in User Management
- Modal: new password + confirm, min 8 chars, mismatch validation
- Success toast + auto-close on completion

Dashboard fix:
- Corrupted .next cache causing "Cannot find module worker.js"
- Fixed by clearing .next cache and restarting dev server

Co-Authored-By: claude-flow <ruv@ruv.net>

packages/api/src/router/user.ts

@@ -126,6 +126,41 @@ export const userRouter = createTRPCRouter({
       return user;
     }),
 
+  setPassword: adminProcedure
+    .input(
+      z.object({
+        userId: z.string(),
+        password: z.string().min(8, "Password must be at least 8 characters"),
+      }),
+    )
+    .mutation(async ({ ctx, input }) => {
+      const user = await ctx.db.user.findUniqueOrThrow({
+        where: { id: input.userId },
+        select: { id: true, name: true, email: true },
+      });
+
+      const { hash } = await import("@node-rs/argon2");
+      const passwordHash = await hash(input.password);
+
+      await ctx.db.user.update({
+        where: { id: input.userId },
+        data: { passwordHash },
+      });
+
+      void createAuditEntry({
+        db: ctx.db,
+        entityType: "User",
+        entityId: user.id,
+        entityName: `${user.name} (${user.email})`,
+        action: "UPDATE",
+        ...(ctx.dbUser?.id ? { userId: ctx.dbUser.id } : {}),
+        source: "ui",
+        summary: "Password reset by admin",
+      });
+
+      return { success: true };
+    }),
+
   updateRole: adminProcedure
     .input(
       z.object({