feat: initial repo — docs and scripts for Gitea read-only token access

Three-layer access scheme: owner -> reader account -> scoped API token.
Includes 6 automation scripts, config template, EN/RU docs, and manual curl guide.

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

config.example.ini

@@ -0,0 +1,18 @@
+[gitea]
+url = https://git.example.com
+api_url = https://git.example.com/api/v1
+
+[owner]
+# Admin account that owns the repositories
+username = myuser
+password = mypassword
+
+[reader]
+# Restricted read-only account
+username = myreader
+password = readerpassword
+email = myreader@noreply.local
+token_name = installer-readonly
+token_scope = read:repository
+# After running setup-reader.sh, the token will be written here:
+# token = sha1_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx