app-email rollout: gitea + rallly mappings; calcom/nextcloud/immich = findings

gitea (STARTTLS + FORCE_TRUST_SERVER_CERT) and rallly (Nodemailer STARTTLS +
SMTP_REJECT_UNAUTHORIZED=false) wired. Fixed rallly's non-existent 3.12.1 pin → 3.11.2.
calcom/nextcloud/immich don't fit the mechanism (self-signed opportunistic-STARTTLS,
split From, no-SMTP-env) — see FINDING doc in felhom.eu.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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# Changelog
## 2026-06-29 — App-email rollout: gitea + rallly (calcom/nextcloud/immich = findings)
- **gitea 1.23.4** — added `smtp_mapping` (STARTTLS via `GITEA__mailer__PROTOCOL=smtp+starttls` +
`FORCE_TRUST_SERVER_CERT=true` to trust the shim's self-signed cert; single `GITEA__mailer__FROM`). Compose
references the injected `GITEA__mailer__*` keys; env applied every boot.
- **rallly** — added `smtp_mapping` (Nodemailer STARTTLS, `SMTP_SECURE=false` + `SMTP_REJECT_UNAUTHORIZED=false`
to accept the self-signed cert; single `NOREPLY_EMAIL`). **Also fixed a broken image pin:** `3.12.1` does not
exist (3.x stops at 3.11.x) → corrected to `3.11.2` so the template is deployable.
- **NOT wired — reported as findings** (`felhom.eu/documentation/audits/FINDING-app-email-rollout-2026-06-29.md`):
- **cal.com v4.8.7** — hard-codes TLS `rejectUnauthorized:true` with no override; opportunistic STARTTLS
against the self-signed shim fails. Needs a non-STARTTLS-advertising plaintext listener (mechanism change).
- **nextcloud 31** — no cert-skip env (same opportunistic-STARTTLS gap) **and** a split From
(`MAIL_FROM_ADDRESS`+`MAIL_DOMAIN`) the single-`from_var` mapping can't express.
- **immich v2.5.5** — no SMTP env vars at all; config is admin-UI/DB or an `IMMICH_CONFIG_FILE` JSON. Does not
fit env-injection; left for a future config-file-injection mechanism (or manual admin-UI setup).
## 2026-06-29 — App-email: smtp_mapping for Vaultwarden + Mealie
- Added the `smtp_mapping` block to `templates/vaultwarden/.felhom.yml` and `templates/mealie/.felhom.yml`,
enabling managed outbound email (app → in-controller shim → hub → Resend) for the two spike-proven apps