refactor(dataflows): name the shared modules by what they hold

- interface -> router; symbol_utils -> symbols, which also takes safe_ticker_component
- utils is split: get_current_date to date_window, the HTTP helpers to net
- dataflows imports are absolute; the NoMarketDataError re-export from symbols is gone

cli/main.py

@@ -44,7 +44,7 @@ from cli.utils import (
 )
 from tradingagents.agents.utils.rating import is_review
 from tradingagents.backtest import iter_grid, run_backtest, summarize
-from tradingagents.dataflows.utils import safe_ticker_component
+from tradingagents.dataflows.symbols import safe_ticker_component
 from tradingagents.default_config import DEFAULT_CONFIG
 from tradingagents.graph.analyst_execution import (
     AnalystWallTimeTracker,

cli/utils.py

@@ -71,7 +71,7 @@ def normalize_ticker_symbol(ticker: str) -> str:
     plain upper-case if the data layer is unavailable.
     """
     try:
-        from tradingagents.dataflows.symbol_utils import normalize_symbol
+        from tradingagents.dataflows.symbols import normalize_symbol
 
         return normalize_symbol(ticker)
     except Exception: