Add CODEOWNERS and Dependabot configuration

Set @Morry98 as default code owner for all files.
Configure Dependabot for weekly updates on both pip
dependencies and GitHub Actions.

Author: Morry98

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# Default owner for all files
+* @Morry98

.github/dependabot.yml

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+version: 2
+updates:
+  # Python dependencies (pip)
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 10
+    labels:
+      - "dependencies"
+    commit-message:
+      prefix: "deps"
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "ci"
+    commit-message:
+      prefix: "ci"