docs: bootstrap AtayMakhzan fork identity

Co-Authored-By: Al-Khawarizmi <al-khawarizmi@hermes.local>

FORK_CHANGELOG.md

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+# AtayMakhzan Fork Changelog
+
+This file records every intentional divergence from upstream Gitea.
+
+## Fork basis
+
+| Item | Value |
+|---|---|
+| Upstream project | `go-gitea/gitea` |
+| Initial tag | `v1.26.2` |
+| Local branch | `atay/v1.26.2` |
+| Origin | `ssh://git@ataymakhzan.com:2222/ibnezzoubayr/Atay-Makhzan.git` |
+
+## 0.1.0-planning
+
+- Created AtayMakhzan fork identity documentation.
+- No source-code behavior changes yet.
+- No database, auth, Git transport, or permission changes.
+
+## Divergence rules
+
+Every future entry must include:
+
+1. upstream base commit/tag;
+2. files changed;
+3. reason for divergence;
+4. test/build verification;
+5. production migration/rollback notes if deployment-relevant.