feat: Add orchestration models and services for Kubernetes cluster management

- Implemented Pydantic models for Kubernetes cluster state representation in `cluster.py`.
- Created a `Resource` class for converting JSON/dict to Python objects in `resource.py`.
- Established user models and services for user management, including password hashing and JWT token generation.
- Developed application orchestration services for managing Kubernetes applications, including installation and uninstallation.
- Added cluster service for retrieving cluster status and health reports.
- Introduced node service for fetching node resource details and health status.
- Implemented user service for handling user authentication and management.

migration/alembic/versions/796b67d23c1c_create_initial_tables.py

@@ -0,0 +1,49 @@
+"""create initial tables
+
+Revision ID: 796b67d23c1c
+Revises: 
+Create Date: 2025-08-23 16:05:51.420713
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '796b67d23c1c'
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('user_id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('username', sa.String(length=64), nullable=False),
+    sa.Column('email', sa.String(length=128), nullable=False),
+    sa.Column('hashed_password', sa.String(length=128), nullable=False),
+    sa.Column('is_active', sa.Boolean(), nullable=False),
+    sa.Column('is_admin', sa.Boolean(), nullable=False),
+    sa.Column('created_at', sa.TIMESTAMP(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.TIMESTAMP(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('last_login_at', sa.TIMESTAMP(timezone=True), nullable=True),
+    sa.PrimaryKeyConstraint('user_id')
+    )
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_user_id'), 'users', ['user_id'], unique=False)
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_index(op.f('ix_users_user_id'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_table('users')
+    # ### end Alembic commands ###