Update README.md

docs: update README to include emoji for Docker Compose section for better visual appeal

docs: simplify Docker Compose section in README by removing unnecessary details

docs: update README to include detailed changelog for v0.4.0 and v0.3.0 releases, highlighting new features, optimizations, fixes, and breaking changes

fix(ci): pin ruff version to 0.9.1 for consistent linting

fix(ci): install ruff and pytest for linting and tests

docs: add v0.4.0 changelog to README

docs: update README - fix LightRAG naming and remove missing image

fix(ci): use requirements.txt instead of missing requirements-dev.txt

delete: remove OPTIMIZATION_SUMMARY.md file containing frontend optimization details and summaries

feat(agent): enhance agent functionality with new features and optimizations

fix(agent): phase 2 optimization - CRAG, routing, input validation

fix(agent): critical fixes for agent mode stability

feat(graph): add few-shot examples to Cypher generation prompt

fix(neo4j): handle NEO4J_AUTH=none with dummy password fallback