feat: Add database migrations and auth system

- Add Alembic for database migrations
- Implement user authentication system
- Update frontend styles and components
- Add new test audio functionality
- Update stream management and UI

models.py

@@ -8,7 +8,7 @@ from database import engine
 class User(SQLModel, table=True):
     token_created: datetime = Field(default_factory=datetime.utcnow)
     email: str = Field(primary_key=True)
-    username: str
+    username: str = Field(unique=True, index=True)
     token: str
     confirmed: bool = False
     ip: str = Field(default="")
@@ -23,11 +23,23 @@ class UploadLog(SQLModel, table=True):
     id: Optional[int] = Field(default=None, primary_key=True)
     uid: str
     ip: str
-    filename: Optional[str]
+    filename: Optional[str]  # Original filename
+    processed_filename: Optional[str]  # Processed filename (UUID.opus)
     size_bytes: int
     created_at: datetime = Field(default_factory=datetime.utcnow)
 
 
+class DBSession(SQLModel, table=True):
+    token: str = Field(primary_key=True)
+    user_id: str = Field(foreign_key="user.username")
+    ip_address: str
+    user_agent: str
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    expires_at: datetime
+    is_active: bool = True
+    last_activity: datetime = Field(default_factory=datetime.utcnow)
+
+
 def get_user_by_uid(uid: str) -> Optional[User]:
     with Session(engine) as session:
         statement = select(User).where(User.username == uid)