feat: Implement Keycloak authentication and a basic CMS

Integrates Keycloak for secure administrator authentication using Arctic.
Introduces a full CMS dashboard for managing CV content, supporting multi-language editing for profile, experience, and education sections.

Refactors application routes for modularity and adds initial unit tests for database queries.

Also includes minor UI/UX refinements, animation setup, and local Keycloak docker-compose configuration.

Fixes:
- Corrected KeyCloak import.
- Restored missing getEducation function.
- Ensured proper HTTP redirects.
- Fixed PKCE code verifier length.

tests/db.test.ts

@@ -0,0 +1,53 @@
+import { describe, expect, it, beforeAll } from "bun:test";
+import { getAllData, getProfile, getExperience } from "../src/db/queries";
+import { initDB, db } from "../src/db/schema";
+import { seedDB } from "../src/db/seed";
+
+// Use an in-memory DB or a separate test DB file for isolation
+// For simplicity in this specific setup, we are testing against the existing file 
+// or re-seeding it. In a CI env, we'd use ':memory:'.
+// Let's ensure the DB is seeded before testing.
+beforeAll(() => {
+    seedDB();
+});
+
+describe("Database Queries", () => {
+    it("should fetch English profile data correctly", () => {
+        const profile = getProfile("en");
+        expect(profile).not.toBeNull();
+        expect(profile?.name).toBe("John Doe");
+        expect(profile?.job_title).toBe("Full Stack Developer");
+    });
+
+    it("should fetch German profile data correctly", () => {
+        const profile = getProfile("de");
+        expect(profile).not.toBeNull();
+        expect(profile?.name).toBe("John Doe");
+        expect(profile?.job_title).toBe("Full Stack Entwickler"); // Translation check
+    });
+
+    it("should fetch experience sorted by order", () => {
+        const experience = getExperience("en");
+        expect(Array.isArray(experience)).toBe(true);
+        if (experience.length > 0) {
+            expect(experience[0]).toHaveProperty("company_name");
+            expect(experience[0]).toHaveProperty("role");
+        }
+    });
+
+    it("getAllData should return all sections", () => {
+        const data = getAllData("en");
+        expect(data).toHaveProperty("profile");
+        expect(data).toHaveProperty("experience");
+        expect(data).toHaveProperty("education");
+        expect(data).toHaveProperty("skills");
+    });
+    
+    it("should return null/empty for non-existent language", () => {
+        // Our query logic returns null if the join fails usually, 
+        // but let's see how the current implementation behaves with invalid input.
+        const profile = getProfile("fr"); 
+        // Depending on implementation, this might be null or undefined
+        expect(profile).toBeNull();
+    });
+});