refactor: remove mock trading functionality from backend and frontend

Removes all mock price simulation features:
- Delete MockPriceManager from backend/data/
- Remove mock_mode, enable_mock, is_mock_mode flags from services
- Remove mock CLI options and config
- Remove mock mode UI components and state from frontend
- Update tests to remove mock references

Now system supports only live and backtest modes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/utils/terminal_dashboard.py

@@ -30,7 +30,6 @@ class TerminalDashboard:
         self.port = 8765
         self.poll_interval = 10
         self.trigger_time = "now"
-        self.mock = False
         self.enable_memory = False
         self.local_time = ""
         self.nyse_time = ""
@@ -65,7 +64,6 @@ class TerminalDashboard:
         port: int,
         poll_interval: int,
         trigger_time: str = "now",
-        mock: bool = False,
         enable_memory: bool = False,
         local_time: str = "",
         nyse_time: str = "",
@@ -82,7 +80,6 @@ class TerminalDashboard:
         self.port = port
         self.poll_interval = poll_interval
         self.trigger_time = trigger_time
-        self.mock = mock
         self.enable_memory = enable_memory
         self.local_time = local_time
         self.nyse_time = nyse_time
@@ -109,8 +106,6 @@ class TerminalDashboard:
         # Mode line
         if self.mode == "backtest":
             mode_str = "[cyan]Backtest[/cyan]"
-        elif self.mock:
-            mode_str = "[yellow]MOCK[/yellow]"
         else:
             mode_str = "[green]LIVE[/green]"
 
@@ -216,8 +211,6 @@ class TerminalDashboard:
         title = "[bold cyan]EvoTraders[/bold cyan]"
         if self.mode == "backtest":
             title += " [dim]Backtest[/dim]"
-        elif self.mock:
-            title += " [dim]Mock[/dim]"
         else:
             title += " [dim]Live[/dim]"