fix: resolve 18-point audit items including http payload error helpers, python-dotenv auto-load, and exception wrapping

app/__init__.py

@@ -1,16 +1,22 @@
-__version__ = "1.1.0"
 import os
 from flask import Flask, render_template, jsonify
+from dotenv import load_dotenv
 from app.db import db
 from app.api import accounts, emails
 
+__version__ = "1.1.0"
+
 def create_app():
+    load_dotenv()
     app = Flask(__name__)
     
-    db_path = os.getenv("DATABASE_URL", f"sqlite:///{os.path.join(os.getcwd(), 'ni_mail.db')}")
+    data_dir = os.getenv("DATA_DIR", os.getcwd())
+    default_db = f"sqlite:///{os.path.join(data_dir, 'ni_mail.db')}"
+    db_path = os.getenv("DATABASE_URL", default_db)
+    
     app.config["SQLALCHEMY_DATABASE_URI"] = db_path
     app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
-    app.config["SECRET_KEY"] = os.getenv("SECRET_KEY", "ni-mail-secret-key")
+    app.config["SECRET_KEY"] = os.getenv("SECRET_KEY", "ni-mail-secret-key-v1.1.0")
     
     db.init_app(app)
     
@@ -23,7 +29,11 @@ def create_app():
         
     @app.route("/health")
     def health():
-        return jsonify({"status": "ok", "app": "ni-mail"})
+        return jsonify({
+            "status": "ok",
+            "app": "ni-mail",
+            "version": __version__
+        })
         
     with app.app_context():
         db.create_all()