refactor: фаза 5 — чистка (APP_VERSION, LLM константы)

- constants.py: APP_VERSION, LLM_DEFAULT_TEMPERATURE, LLM_RESPONSE_FORMAT
- main.py: версия из APP_VERSION (вместо хардкод '0.1.0'×2)
- llm.py: temperature и response_format из constants

Всего: 85 тестов, ruff clean

guarddog_nexus/constants.py

@@ -154,6 +154,8 @@ CSV_MEDIA_TYPE = "text/csv"
 LLM_DEFAULT_MODEL = "gpt-4o-mini"
 LLM_DEFAULT_API_BASE = "https://api.openai.com/v1"
 LLM_DEFAULT_TIMEOUT = 30
+LLM_DEFAULT_TEMPERATURE = 0.3
+LLM_RESPONSE_FORMAT = "json_object"
 LLM_ANALYSIS_SYSTEM_PROMPT = (
     "You are a security analyst reviewing GuardDog findings for a software package. "
     "Given a finding (rule name, severity, message, code snippet, location), "
@@ -173,6 +175,7 @@ LLM_ANALYSIS_SYSTEM_PROMPT = (
 APP_NAME = "GuardDog Nexus"
 APP_DESCRIPTION = "Scan PyPI packages from Sonatype Nexus webhooks using GuardDog"
 APP_PACKAGE = "guarddog_nexus"
+APP_VERSION = "0.1.0"
 
 # ---------------------------------------------------------------------------
 # HTTP