feat: overhaul MCP server with typed tools, resources, prompts, and structured output

feat: upgrade mcp-go to v0.46.0, add LogchefQL and investigation tools

feat: update LogQueryResponse to match new API format

docs: update Docker image reference to ghcr.io/mr-karan/logchef-mcp

docs: improve MCP server configuration examples

feat: support flexible log schema instead of fixed OTEL format

chore: docs

feat: init project

Initial commit