feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/pure-rand/lib/distribution/UnsafeUniformBigIntDistribution.js

@@ -0,0 +1,28 @@
+"use strict";
+exports.__esModule = true;
+exports.unsafeUniformBigIntDistribution = void 0;
+var SBigInt = typeof BigInt !== 'undefined' ? BigInt : undefined;
+function unsafeUniformBigIntDistribution(from, to, rng) {
+    var diff = to - from + SBigInt(1);
+    var MinRng = SBigInt(-0x80000000);
+    var NumValues = SBigInt(0x100000000);
+    var FinalNumValues = NumValues;
+    var NumIterations = 1;
+    while (FinalNumValues < diff) {
+        FinalNumValues *= NumValues;
+        ++NumIterations;
+    }
+    var MaxAcceptedRandom = FinalNumValues - (FinalNumValues % diff);
+    while (true) {
+        var value = SBigInt(0);
+        for (var num = 0; num !== NumIterations; ++num) {
+            var out = rng.unsafeNext();
+            value = NumValues * value + (SBigInt(out) - MinRng);
+        }
+        if (value < MaxAcceptedRandom) {
+            var inDiff = value % diff;
+            return inDiff + from;
+        }
+    }
+}
+exports.unsafeUniformBigIntDistribution = unsafeUniformBigIntDistribution;