Strengthen setup password validation

- Add backend Pydantic password complexity validation for setup
- Update frontend setup page with password rule feedback and strength indicator
- Add/adjust setup API tests for password validation
- Document setup password requirements
- Fix frontend test type annotation issue

frontend/src/utils/__tests__/queryUtils.test.ts

@@ -1,9 +1,10 @@
 import { describe, expect, it } from "vitest";
 import { areHistoryQueriesEqual } from "../queryUtils";
+import type { HistoryQuery } from "../../types/history";
 
 describe("areHistoryQueriesEqual", () => {
   it("returns true for identical history queries", () => {
-    const a = {
+    const a: HistoryQuery = {
       range: "7d",
       origin: "blocklist",
       jail: "ssh",
@@ -19,7 +20,7 @@ describe("areHistoryQueriesEqual", () => {
   });
 
   it("returns false when a single query field differs", () => {
-    const base = {
+    const base: HistoryQuery = {
       range: "7d",
       origin: "all",
       jail: "ssh",