docs: verify Gitea 1.27.0 compatibility — no mail template changes

Verification results:
- 0 files changed in templates/mail/ or services/mailer/ between v1.26.0 and v1.27.0
- All 110 templates (10 themes × 11 types) render successfully
- No new mail template types, no removed types
- No changes to template functions or data contexts
- No breaking changes for mail templates

Marking v1.0.1 as compatible with Gitea 1.27.0.

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

COMPATIBILITY.md

@@ -7,7 +7,7 @@ This document tracks the compatibility between **Gitea Mail Templates** releases
 <!-- TRACKER:QUICK-REF-MAX OFFSET=3 -->
 | Template Release | Min Gitea | Max Tested Gitea | Status |
 |-----------------|-----------|-----------------|--------|
-| **v1.0.1**      | **1.25.0** | **1.27.0** | ⏳ Pending Verification |
+| **v1.0.1**      | **1.25.0** | **1.27.0** | ✅ Active |
 | **v1.0.0**      | **1.25.0** | **1.26.4** | ✅ Superseded |
 
 > **Latest verified:** All 11 templates pass validation against Gitea 1.27.0 data contexts. <!-- TRACKER:LATEST-VERIFIED -->
@@ -25,7 +25,7 @@ gitea --version
 <!-- TRACKER:VERSION-INSERT OFFSET=2 -->
 | Gitea | Release Date | Mail Template Changes | Breaking? |
 |-------|-------------|----------------------|-----------|
-| **1.27.0** | 2026-07-14 | ⏳ Pending Verification | TBD |
+| **1.27.0** | 2026-07-13 | None — no mail template changes | No |
 | **1.26.4** | 2026-06-21 | None — hotfix release | No |
 | **1.26.3** | 2026-06-20 | None — security release | No |
 | **1.26.2** | 2026-05-20 | None — security + bug fixes | No |