Add Redmine/Gitea env placeholders and 2026-06-08 DDS Q&A session note

- .env.example: REDMINE_URL/API_KEY and GITEA_URL/USER/PASSWORD/TOKEN
  placeholders so a fresh clone surfaces the optional tracker/mirror
  hookups without exposing real credentials.
- docs/notes/2026-06-08-dds-qa-session.md: personal session reference
  covering DDS role model, scenario walkthrough, group/DB Link/Data
  Catalog patterns, and the mapping-table vs declarative-DDL decision.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -59,3 +59,13 @@ export MY_PASSWORD=""
 # --- (6) ADB → 원격 DB Link 이름 (관례적으로 고정 — 굳이 안 바꿔도 됨) ---
 export DBLINK_PG_NAME="RDS_POSTGRES_LINK"
 export DBLINK_MY_NAME="RDS_LINK"
+
+# --- (7) Redmine (project tracker) ---
+export REDMINE_URL=https://redmine.example.com
+export REDMINE_API_KEY=<your-redmine-api-key>
+
+# --- (8) Gitea (self-hosted git) ---
+export GITEA_URL=https://gittea.example.com
+export GITEA_USER=<your-gitea-login>
+export GITEA_PASSWORD=<your-gitea-password>
+export GITEA_TOKEN=<minted-from-the-above>