Add ditenv package and update .env.example file

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "a6f9d7361f9826b6d6b6b6fa3331b8f468dbda1d913fa809ee8adae15b88e4d9"
+            "sha256": "f28cb0e9366b2f53950ace8489d74eb4fd492f073cfc18581ee36e12e516bc01"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -563,6 +563,13 @@
             ],
             "version": "==0.4.0"
         },
+        "dotenv": {
+            "hashes": [
+                "sha256:29cf74a087b31dafdb5a446b6d7e11cbce8ed2741540e2339c69fbef92c94ce9"
+            ],
+            "index": "pypi",
+            "version": "==0.9.9"
+        },
         "filelock": {
             "hashes": [
                 "sha256:adbc88eabb99d2fec8c9c1b229b171f18afa655400173ddc653d5d01501fb9f2",
@@ -640,6 +647,14 @@
             "markers": "python_version >= '3.8'",
             "version": "==2025.6"
         },
+        "python-dotenv": {
+            "hashes": [
+                "sha256:31f23644fe2602f88ff55e1f5c79ba497e01224ee7737937930c448e4d0e24dc",
+                "sha256:a8a6399716257f45be6a007360200409fce5cda2661e3dec71d23dc15f6189ab"
+            ],
+            "markers": "python_version >= '3.9'",
+            "version": "==1.1.1"
+        },
         "pyyaml": {
             "hashes": [
                 "sha256:01179a4a8559ab5de078078f37e5c1a30d76bb88519906844fd7bdea1b7729ff",