feat(configs): add GEO AgentKit Server configuration
- llm_config.yaml: DeepSeek + OpenAI-compatible providers with env var substitution
- skills/ (8 YAML): citation_detector, content_generator, deai_agent, geo_optimizer,
monitor, schema_advisor, competitor_analyzer, trend_agent
- Added intent fields for content_generator, competitor_analyzer, trend_agent
- Added quality_gate fields for content_generator, deai_agent, geo_optimizer
- Updated custom_handler paths to configs.geo_handlers
- geo_tools.py: 14 FunctionTools calling GEO Backend via HTTP
- geo_handlers.py: 3 custom handlers (citation/monitor/schema) calling /internal/ API
- geo_server.py: FastAPI factory with LLM Gateway, Tool Registry, Skill Registry
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