feat(data-platform): complete phase 2.1 hardening

[Flames4fun]

Summary

Complete Phase 2.1 hardening for local reproducibility and CI.

Changes

• add warehouse path configuration via env vars
• make dbt profiles portable for dev/test
• add direct dependencies, lockfile, and project metadata
• add minimal CI for clean-environment validation
• document core business metrics
• update docs to reflect WAREHOUSE_PATH

Validation

• python scripts/ingest_raw.py ✅
• pytest -q ✅
• dbt deps ✅
• dbt build ✅

[Flames4fun]

Fix

CI could not find the dataops_ecommerce dbt profile because dbt/profiles.yml is gitignored and was not available in the GitHub runner.

Change

• define DBT_PROFILES_DIR=.ci_dbt_profiles
• generate temporary profiles.yml during the workflow
• run dbt deps and dbt build with --profiles-dir "${DBT_PROFILES_DIR}"

Validation

• reproduced locally with a temporary CI-style profile
• dbt build passed: PASS=235 WARN=0 ERROR=0 SKIP=0 TOTAL=235