feat(api): add knex configuration

backend/knexfile.js

@@ -0,0 +1,14 @@
+export default {
+  client: 'better-sqlite3',
+  connection: {
+    filename: process.env.DB_PATH || './data/cv.db'
+  },
+  migrations: {
+    directory: './migrations',
+    tableName: 'knex_migrations'
+  },
+  seeds: {
+    directory: './seeds'
+  },
+  useNullAsDefault: true
+};

backend/seeds/initial_cv_data.js

@@ -0,0 +1,24 @@
+export async function seed(knex) {
+  const existing = await knex('cv_data').where({ id: 1 }).first();
+  
+  if (!existing) {
+    await knex('cv_data').insert({
+      id: 1,
+      data: JSON.stringify({
+        personal: {
+          name: "Tuan-Dat Tran",
+          title: "Junior DevOps Engineer",
+          intro: "Passionierter DevOps Engineer mit Fokus auf Cloud-Infrastruktur, Container-Orchestrierung und automatisierte Deployment-Pipelines.",
+          email: "tuan-dat.tran@example.com",
+          github: "https://github.com/tuan-dat-tran",
+          linkedin: "https://linkedin.com/in/tuan-dat-tran",
+          location: "Deutschland"
+        },
+        experience: [],
+        skills: {},
+        education: [],
+        projects: []
+      })
+    });
+  }
+}