Initial commit: Energy test data generation pipeline

Add complete test data preparation system for energy trading strategy
demo. Includes configuration, data generation scripts, and validation
tools for 7 datasets covering electricity prices, battery capacity,
renewable/conventional generation, load profiles, data centers, and
mining data.

Excluded from git: Actual parquet data files (data/raw/, data/processed/)
can be regenerated using the provided scripts.

Datasets:
- electricity_prices: Day-ahead and real-time prices (5 regions)
- battery_capacity: Storage system charge/discharge cycles
- renewable_generation: Solar, wind, hydro with forecast errors
- conventional_generation: Gas, coal, nuclear plant outputs
- load_profiles: Regional demand with weather correlations
- data_centers: Power demand profiles including mining operations
- mining_data: Hashrate, price, profitability (mempool.space API)

config/data_config.yaml

@@ -0,0 +1,96 @@
+# Energy Test Data Configuration
+# For energy trading strategy demo
+
+time_range:
+  # Last 10 days from current date (adjustable)
+  start_date: "2026-01-31"
+  end_date: "2026-02-10"
+  granularity: "1min"  # 1-minute intervals
+
+regions:
+  # European energy markets
+  - "FR"  # France
+  - "BE"  # Belgium
+  - "DE"  # Germany
+  - "NL"  # Netherlands
+  - "UK"  # United Kingdom
+
+data_sources:
+  electricity_prices:
+    type: "hybrid"
+    historical_source: "epex_spot"
+    synthetic_patterns: true
+  battery_capacity:
+    type: "synthetic"
+    num_batteries: 10
+  renewable_generation:
+    type: "synthetic"
+    plants_per_source: 5
+    sources: ["solar", "wind", "hydro"]
+  conventional_generation:
+    type: "synthetic"
+    num_plants: 10
+    fuel_types: ["gas", "coal", "nuclear"]
+  load_profiles:
+    type: "synthetic"
+    historical_source: "entso_e"
+  data_centers:
+    type: "synthetic"
+    num_centers: 5
+    special_client: "bitcoin"
+  bitcoin_mining:
+    type: "hybrid"
+    historical_source: "mempool.space"
+    synthetic_patterns: true
+
+output:
+  format: "parquet"
+  compression: "snappy"
+  target_size_mb: 200
+  precision: "float32"
+
+generation:
+  seed: 42
+  add_noise: true
+  noise_level: 0.05
+  include_outliers: true
+  outlier_rate: 0.01
+  include_missing_values: true
+  missing_rate: 0.005
+
+battery:
+  capacity_range: [10, 100]  # MWh
+  charge_rate_range: [5, 50]  # MW
+  discharge_rate_range: [5, 50]  # MW
+  efficiency_range: [0.85, 0.95]
+  degradation_rate: 0.001
+
+renewable:
+  solar:
+    capacity_range: [50, 500]  # MW
+    forecast_error_sd: 0.15
+  wind:
+    capacity_range: [100, 800]  # MW
+    forecast_error_sd: 0.20
+  hydro:
+    capacity_range: [50, 300]  # MW
+    forecast_error_sd: 0.05
+
+conventional:
+  gas:
+    capacity_range: [200, 1000]  # MW
+    marginal_cost_range: [30, 80]  # EUR/MWh
+  coal:
+    capacity_range: [300, 1500]  # MW
+    marginal_cost_range: [40, 70]  # EUR/MWh
+  nuclear:
+    capacity_range: [800, 1600]  # MW
+    marginal_cost_range: [10, 30]  # EUR/MWh
+
+data_center:
+  power_demand_range: [10, 100]  # MW
+  price_sensitivity_range: [0.8, 1.2]
+
+bitcoin:
+  hashrate_range: [150, 250]  # EH/s
+  mining_efficiency_range: [25, 35]  # J/TH