refactor: rename project from Predix to NexQuant

Rename all source files, scripts, tests, documentation, and configuration
from Predix/predix to NexQuant/nexquant across the entire codebase.

rdagent/components/backtesting/__init__.py

@@ -1,4 +1,4 @@
-"""Predix Backtesting Package"""
+"""NexQuant Backtesting Package"""
 from .backtest_engine import BacktestMetrics, FactorBacktester
 from .results_db import ResultsDatabase
 from .risk_management import CorrelationAnalyzer, PortfolioOptimizer, AdvancedRiskManager

rdagent/components/backtesting/backtest_engine.py

@@ -1,5 +1,5 @@
 """
-Predix Backtesting Engine - IC, Sharpe, Drawdown
+NexQuant Backtesting Engine - IC, Sharpe, Drawdown
 
 Thin wrapper around the unified ``vbt_backtest.backtest_signal`` engine.
 All metric formulas live in ``vbt_backtest``; this module exists for

rdagent/components/backtesting/protections/__init__.py

@@ -1,5 +1,5 @@
 """
-Trading Protection System for Predix.
+Trading Protection System for NexQuant.
 
 Prevents excessive losses by automatically pausing trading
 when risk thresholds are exceeded.

rdagent/components/backtesting/protections/base.py

@@ -3,7 +3,7 @@ Trading Protection System
 
 Prevents excessive losses by automatically pausing trading when risk thresholds are exceeded.
 
-Inspired by common trading protection patterns, implemented from scratch for Predix.
+Inspired by common trading protection patterns, implemented from scratch for NexQuant.
 """
 
 from abc import ABC, abstractmethod

rdagent/components/backtesting/results_db.py

@@ -1,5 +1,5 @@
 """
-Predix Results Database - SQLite für Backtest-Ergebnisse
+NexQuant Results Database - SQLite für Backtest-Ergebnisse
 
 Stores backtest metrics from Qlib/MLflow runs for querying and dashboard display.
 """
@@ -409,7 +409,7 @@ class ResultsDatabase:
         worst_dd_str = self._fmt_float(best['worst_drawdown'], ".4f")
 
         md_lines = [
-            "# Predix Results Summary",
+            "# NexQuant Results Summary",
             "",
             f"**Generated:** {summary['generated_at']}",
             f"**Database:** `{summary['database_path']}`",

rdagent/components/backtesting/risk_management.py

@@ -1,5 +1,5 @@
 """
-Predix Risk Management - Korrelation, Portfolio-Optimierung
+NexQuant Risk Management - Korrelation, Portfolio-Optimierung
 """
 
 import numpy as np

rdagent/components/backtesting/vbt_backtest.py

@@ -2,7 +2,7 @@
 Unified, verifiable backtesting engine.
 
 Single entry point (`backtest_signal`) used by:
-  - scripts/predix_gen_strategies_real_bt.py
+  - scripts/nexquant_gen_strategies_real_bt.py
   - rdagent/scenarios/qlib/local/strategy_orchestrator.py
   - rdagent/scenarios/qlib/local/optuna_optimizer.py
   - rdagent/components/backtesting/backtest_engine.py