feat: funciones Python para core, cybersecurity, datascience y finance

Agrega funciones Python reutilizables organizadas por dominio:
- core: composicion funcional (pipe, compose, map, filter, reduce, etc.)
- cybersecurity: analisis de amenazas y puertos
- datascience: estadisticas y deteccion de outliers
- finance: indicadores tecnicos y analisis financiero

python/functions/cybersecurity/detect_sql_injection.md

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+---
+name: detect_sql_injection
+kind: function
+lang: py
+domain: cybersecurity
+version: "1.0.0"
+purity: pure
+signature: "def detect_sql_injection(input_str: str) -> tuple"
+description: "Detecta patrones de SQL injection en un string. Retorna (is_threat, pattern) con el nombre del patron detectado."
+tags: [sqli, injection, detection, security, python]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: ""
+imports: [re]
+tested: false
+tests: []
+test_file_path: ""
+file_path: "python/functions/cybersecurity/cybersecurity.py"
+---
+
+## Ejemplo
+
+```python
+detect_sql_injection("' OR '1'='1")
+# (True, "string_tautology")
+
+detect_sql_injection("; DROP TABLE users")
+# (True, "stacked_query")
+
+detect_sql_injection("hello world")
+# (False, "")
+```
+
+## Notas
+
+Detecta 10 patrones: sql_keyword, tautology, stacked_query, comment_injection, string_tautology, union_select, hex_literal, char_function, concat_function, time_based. No reemplaza un WAF pero es util para logging y alertas tempranas.