feat: initial Flask project setup with factory pattern

app/__init__.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+import tomllib
+import os
+
+db = SQLAlchemy()
+
+
+def create_app(config_path=None):
+    app = Flask(__name__, instance_relative_config=True)
+
+    os.makedirs(app.instance_path, exist_ok=True)
+
+    app.config["SQLALCHEMY_DATABASE_URI"] = f"sqlite:///{os.path.join(app.instance_path, 'worklog.db')}"
+    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
+    app.config["SECRET_KEY"] = os.environ.get("SECRET_KEY", "dev-secret-change-in-prod")
+
+    # Load TOML config
+    if config_path is None:
+        config_path = os.path.join(os.path.dirname(app.root_path), "config.toml")
+    if os.path.exists(config_path):
+        with open(config_path, "rb") as f:
+            app.config["TOML"] = tomllib.load(f)
+    else:
+        app.config["TOML"] = {}
+
+    db.init_app(app)
+
+    from app.routes.dashboard import bp as dashboard_bp
+    from app.routes.entries import bp as entries_bp
+    from app.routes.reports import bp as reports_bp
+    app.register_blueprint(dashboard_bp)
+    app.register_blueprint(entries_bp)
+    app.register_blueprint(reports_bp)
+
+    with app.app_context():
+        db.create_all()
+
+    return app

app/routes/dashboard.py

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+from flask import Blueprint
+
+bp = Blueprint("dashboard", __name__)

app/routes/entries.py

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+from flask import Blueprint
+
+bp = Blueprint("entries", __name__)

app/routes/reports.py

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+from flask import Blueprint
+
+bp = Blueprint("reports", __name__)