Add official Gitea MCP server to base image

Install gitea-mcp v1.1.0 (Go binary from gitea.com/gitea/gitea-mcp)
using the same multi-arch pattern as gosu/fzf/bat. Provides 50+ MCP
tools for Gitea API — repos, issues, PRs, releases, branches, wiki,
and Actions.

Disabled by default in auto-generated opencode.json (requires
GITEA_ACCESS_TOKEN and GITEA_HOST to be useful). Users enable it by
setting those env vars in .env and flipping enabled to true in their
opencode.json.

Env vars forwarded into the container via docker-compose.yml and
docker-compose.shared.yml environment blocks. Same {env:VAR} pattern
as the GitHub MCP server.

Docs updated: README.md (new Gitea MCP section with setup steps),
DOCKER_HUB.md (tools list), CHANGELOG.md (v1.14.28b entry).

entrypoint-user.sh

@@ -93,21 +93,33 @@ EOF
       ;;
   esac
 
-  # Add MemPalace MCP server if mempalace is installed
-  if command -v mempalace &>/dev/null && command -v python3 &>/dev/null; then
-    # Use python3 to merge the mcp block into the existing JSON
+  # Add MCP servers for installed tools
+  if command -v python3 &>/dev/null; then
     python3 -c "
-import json, sys
+import json, shutil
 with open('$CONFIG_FILE') as f:
     config = json.load(f)
-config.setdefault('mcp', {})['mempalace'] = {
-    'type': 'local',
-    'command': ['python3', '-m', 'mempalace.mcp_server']
-}
+mcp = config.setdefault('mcp', {})
+
+# MemPalace — local AI memory (if installed)
+if shutil.which('mempalace'):
+    mcp['mempalace'] = {
+        'type': 'local',
+        'command': ['python3', '-m', 'mempalace.mcp_server']
+    }
+
+# Gitea — self-hosted Git forge API (if installed)
+if shutil.which('gitea-mcp'):
+    mcp['gitea'] = {
+        'type': 'local',
+        'command': ['gitea-mcp', '-t', 'stdio'],
+        'enabled': False
+    }
+
 with open('$CONFIG_FILE', 'w') as f:
     json.dump(config, f, indent=2)
     f.write('\n')
-" 2>/dev/null && echo "MemPalace MCP server added to opencode config."
+" 2>/dev/null && echo "MCP servers registered in opencode config."
   fi
 fi