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>

frontend/src/components/AppShell.jsx

@@ -72,7 +72,6 @@ export default function AppShell({
   pollIntervalDraft,
   startDateDraft,
   endDateDraft,
-  enableMockDraft,
   watchlistDraftSymbols,
   watchlistInputValue,
   watchlistSuggestions,
@@ -89,7 +88,6 @@ export default function AppShell({
   onPollIntervalChange,
   onStartDateChange,
   onEndDateChange,
-  onEnableMockChange,
   onWatchlistInputChange,
   onWatchlistInputKeyDown,
   onWatchlistAdd,
@@ -186,44 +184,6 @@ export default function AppShell({
         <Header />
 
         <div className="header-right" style={{ display: 'flex', alignItems: 'center', gap: 24, marginLeft: 'auto', flexWrap: 'wrap', minWidth: 0 }}>
-          {/* Mock Mode Indicator */}
-          {virtualTime && (
-            <div style={{ display: 'flex', alignItems: 'center', gap: 6, padding: '4px 10px', borderRadius: 4, background: '#FF9800', border: '1px solid #FFB74D' }}>
-              <span style={{ fontSize: '14px' }}></span>
-              <span style={{ fontSize: '11px', fontWeight: 600, color: '#FFFFFF', fontFamily: '"Courier New", monospace', letterSpacing: '0.5px' }}>
-                模拟模式
-              </span>
-            </div>
-          )}
-
-          {/* Clock Display (only in Mock mode) */}
-          {virtualTime && (
-            <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
-              <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'flex-end', gap: 2, padding: '4px 12px', borderRadius: 4, background: '#1A237E', border: '1px solid #3F51B5' }}>
-                <span style={{ fontSize: '11px', color: '#999', fontFamily: '"Courier New", monospace', textTransform: 'uppercase', letterSpacing: '0.5px' }}>虚拟时间</span>
-                <span style={{ fontSize: '14px', fontWeight: 700, color: '#FFFFFF', fontFamily: '"Courier New", monospace', letterSpacing: '1px' }}>
-                  {now.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false })}
-                </span>
-                <span style={{ fontSize: '10px', color: '#999', fontFamily: '"Courier New", monospace' }}>
-                  {now.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' })}
-                </span>
-              </div>
-
-              {/* Fast Forward Button (only in Mock mode) */}
-              <button
-                onClick={() => {
-                  if (agentRequests?.clientRef?.current) {
-                    agentRequests.clientRef.current.send({ type: 'fast_forward_time', minutes: 30 });
-                  }
-                }}
-                style={{ padding: '6px 12px', borderRadius: 4, background: '#3F51B5', border: '1px solid #5C6BC0', color: '#FFFFFF', fontSize: '12px', fontFamily: '"Courier New", monospace', fontWeight: 600, cursor: 'pointer', display: 'flex', alignItems: 'center', gap: 4, textTransform: 'uppercase', letterSpacing: '0.5px' }}
-                title="快进30分钟 (Mock模式)"
-              >
-                ⏩ +30min
-              </button>
-            </div>
-          )}
-
           {/* Unified Status Indicator */}
           <div className="header-status-inline">
             <span className={`status-dot ${isConnected ? (isUpdating ? 'updating' : 'live') : 'offline'}`} />
@@ -320,7 +280,6 @@ export default function AppShell({
             pollInterval={pollIntervalDraft}
             startDate={startDateDraft}
             endDate={endDateDraft}
-            enableMock={enableMockDraft}
             watchlistSymbols={watchlistDraftSymbols}
             watchlistInputValue={watchlistInputValue}
             watchlistSuggestions={watchlistSuggestions}
@@ -339,7 +298,6 @@ export default function AppShell({
             onPollIntervalChange={onPollIntervalChange}
             onStartDateChange={onStartDateChange}
             onEndDateChange={onEndDateChange}
-            onEnableMockChange={onEnableMockChange}
             onWatchlistInputChange={onWatchlistInputChange}
             onWatchlistInputKeyDown={onWatchlistInputKeyDown}
             onWatchlistAdd={onWatchlistAdd}