Implement distribution management API and UI forms; add distribution model and tests

models/distribution.py

@@ -0,0 +1,14 @@
+from sqlalchemy import Column, Integer, String, JSON
+from config.database import Base
+
+
+class Distribution(Base):
+    __tablename__ = "distribution"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False)
+    distribution_type = Column(String, nullable=False)
+    parameters = Column(JSON, nullable=True)
+
+    def __repr__(self):
+        return f"<Distribution id={self.id} name={self.name} type={self.distribution_type}>"