Release v0.2.0

What's changed

Added

• SAP AI Core upstream support — routes requests to a configurable SAP AI Core base URL; resource group forwarded via AI-Resource-Group header
• Router struct encapsulating upstream detection logic; NewRouter(sapBaseURL, sapAuthHost) constructor replaces the previous package-level DetectUpstream function
• Request body capture with configurable scrubbing pipeline (AUDIT_CAPTURE_REQUESTS, AUDIT_SCRUB_PATTERNS)
• PatternScrubber — compiles Go regexp patterns at startup, replaces matches with [REDACTED] before storage
• user_messages field: structured, queryable extraction of user-role message content from request bodies
• request_captured field: boolean flag per audit row indicating whether request body was stored
• Migration 003_request_capture.sql adding the two new columns to existing installations
• Dockerfile — multi-stage build (golang:1.25-alpine → gcr.io/distroless/static:nonroot), fully static binary, non-root runtime
• docker-compose.yml — local development stack with ClickHouse; migrations auto-applied on first start
• GitHub Actions CI workflow — go vet, go test -race, build verification, multi-arch Docker build check on every push and PR
• GitHub Actions release workflow — multi-arch Docker image pushed to GHCR, static binaries for linux/amd64, linux/arm64, darwin/amd64, darwin/arm64, auto-generated changelog, GitHub Release with SHA-256 checksums

Fixed

• handler_test.go — updated two NewHandler call sites to pass the required *Router argument introduced by the SAP AI Core feature
• router_test.go — updated all DetectUpstream calls to use defaultRouter.DetectUpstream() following the promotion of DetectUpstream from a package-level function to a *Router method