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/happy-dom/lib/nodes/processing-instruction/ProcessingInstruction.d.ts

@@ -0,0 +1,19 @@
+import CharacterData from '../character-data/CharacterData.js';
+import NodeTypeEnum from '../node/NodeTypeEnum.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+/**
+ * Processing instruction node interface.
+ *
+ * Reference: https://developer.mozilla.org/en-US/docs/Web/API/ProcessingInstruction.
+ */
+export default class ProcessingInstruction extends CharacterData {
+    [PropertySymbol.nodeType]: NodeTypeEnum;
+    [PropertySymbol.target]: string;
+    /**
+     * Returns target.
+     *
+     * @returns Target.
+     */
+    get target(): string;
+}
+//# sourceMappingURL=ProcessingInstruction.d.ts.map

frontend/node_modules/happy-dom/lib/nodes/processing-instruction/ProcessingInstruction.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"ProcessingInstruction.d.ts","sourceRoot":"","sources":["../../../src/nodes/processing-instruction/ProcessingInstruction.ts"],"names":[],"mappings":"AAAA,OAAO,aAAa,MAAM,oCAAoC,CAAC;AAC/D,OAAO,YAAY,MAAM,yBAAyB,CAAC;AACnD,OAAO,KAAK,cAAc,MAAM,yBAAyB,CAAC;AAE1D;;;;GAIG;AACH,MAAM,CAAC,OAAO,OAAO,qBAAsB,SAAQ,aAAa;IACxD,CAAC,cAAc,CAAC,QAAQ,CAAC,eAA0C;IACnE,CAAC,cAAc,CAAC,MAAM,CAAC,EAAE,MAAM,CAAC;IAEvC;;;;OAIG;IACH,IAAW,MAAM,IAAI,MAAM,CAE1B;CACD"}

frontend/node_modules/happy-dom/lib/nodes/processing-instruction/ProcessingInstruction.js

@@ -0,0 +1,21 @@
+import CharacterData from '../character-data/CharacterData.js';
+import NodeTypeEnum from '../node/NodeTypeEnum.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+/**
+ * Processing instruction node interface.
+ *
+ * Reference: https://developer.mozilla.org/en-US/docs/Web/API/ProcessingInstruction.
+ */
+export default class ProcessingInstruction extends CharacterData {
+    [PropertySymbol.nodeType] = NodeTypeEnum.processingInstructionNode;
+    [PropertySymbol.target];
+    /**
+     * Returns target.
+     *
+     * @returns Target.
+     */
+    get target() {
+        return this[PropertySymbol.target];
+    }
+}
+//# sourceMappingURL=ProcessingInstruction.js.map

frontend/node_modules/happy-dom/lib/nodes/processing-instruction/ProcessingInstruction.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"ProcessingInstruction.js","sourceRoot":"","sources":["../../../src/nodes/processing-instruction/ProcessingInstruction.ts"],"names":[],"mappings":"AAAA,OAAO,aAAa,MAAM,oCAAoC,CAAC;AAC/D,OAAO,YAAY,MAAM,yBAAyB,CAAC;AACnD,OAAO,KAAK,cAAc,MAAM,yBAAyB,CAAC;AAE1D;;;;GAIG;AACH,MAAM,CAAC,OAAO,OAAO,qBAAsB,SAAQ,aAAa;IACxD,CAAC,cAAc,CAAC,QAAQ,CAAC,GAAG,YAAY,CAAC,yBAAyB,CAAC;IACnE,CAAC,cAAc,CAAC,MAAM,CAAC,CAAS;IAEvC;;;;OAIG;IACH,IAAW,MAAM;QAChB,OAAO,IAAI,CAAC,cAAc,CAAC,MAAM,CAAC,CAAC;IACpC,CAAC;CACD"}