feat: Add Renovate for automated dependency updates

Author: nikolay-e

renovate.json

@@ -0,0 +1,61 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    ":dependencyDashboard",
+    ":semanticCommits",
+    ":automergeDigest",
+    ":automergePatch",
+    ":automergeMinor"
+  ],
+  "timezone": "Europe/Berlin",
+  "schedule": ["before 6am on monday"],
+  "labels": ["dependencies", "renovate"],
+  "prHourlyLimit": 5,
+  "prConcurrentLimit": 10,
+  "packageRules": [
+    {
+      "description": "Auto-merge patch and minor updates",
+      "matchUpdateTypes": ["patch", "minor"],
+      "automerge": true,
+      "automergeType": "pr",
+      "automergeStrategy": "squash"
+    },
+    {
+      "description": "Auto-merge GitHub Actions updates",
+      "matchManagers": ["github-actions"],
+      "automerge": true
+    },
+    {
+      "description": "Auto-merge Docker image updates",
+      "matchDatasources": ["docker"],
+      "matchUpdateTypes": ["patch", "minor"],
+      "automerge": true
+    },
+    {
+      "description": "Security updates - high priority",
+      "matchCategories": ["security"],
+      "labels": ["security", "priority-high"],
+      "automerge": true,
+      "schedule": ["at any time"]
+    },
+    {
+      "description": "Major updates require manual review",
+      "matchUpdateTypes": ["major"],
+      "automerge": false,
+      "labels": ["major-update", "review-required"]
+    }
+  ],
+  "docker": {
+    "enabled": true
+  },
+  "npm": {
+    "enabled": true
+  },
+  "pip_requirements": {
+    "enabled": true
+  },
+  "github-actions": {
+    "enabled": true
+  }
+}