Add self-service API tokens (PATs) with UI + Bearer auth (#35)

Personal access tokens so scripts/CI can call the management API without a
browser session. Each logged-in user mints their own token; it authenticates as
the creator (carries their LDAP group permissions, re-resolved live), so the
existing permission.byGroup checks apply unchanged.

- models/api_token.js: new ApiToken model (sso_<id>_<secret> format; id is the
  lookup key, secret bcrypt-hashed + isPrivate, shown once). add()/rotate()/
  authenticate(); optional expires_at; best-effort last_used_on. No _ttl
  (persists; lifetime via expires_at).
- routes/api_token.js: self-service CRUD (list/get/update/delete/rotate),
  owner-scoped (created_by === req.user.uid, 403 otherwise).
- middleware/auth.js + models/auth.js: accept `Authorization: Bearer sso_...`
  (precedence over the auth-token session header); checkApiToken collapses
  every failure to one generic 401 (no existence/secret/expiry leak).
- views/api_tokens.ejs + routes/index.js (GET /api-tokens): self-service page
  (forceLogin, no group gate) — create (token shown once), edit, rotate, revoke.
- views/top.ejs: "API Tokens" nav entry visible to all logged-in users.
- public/js/app.js: app.apiToken client module.
- DEPLOYMENT.md + docs/deployment.md: API tokens section.

Co-authored-by: Claude <noreply@anthropic.com>

nodejs/public/js/app.js

@@ -287,6 +287,40 @@ app.oauthClient = (function(app){
 	return { list, add, remove, update, rotateSecret };
 })(app);
 
+app.apiToken = (function(app){
+	function list(callback){
+		return app.api.get('api-token/', function(error, data){
+			if(callback) callback(error, data);
+		});
+	}
+
+	function add(args, callback){
+		app.api.post('api-token/', args, function(error, data){
+			callback(error, data);
+		});
+	}
+
+	function update(args, callback){
+		app.api.put('api-token/' + args.id, args, function(error, data){
+			callback(error, data);
+		});
+	}
+
+	function remove(args, callback){
+		app.api.delete('api-token/' + args.id, function(error, data){
+			callback(error, data);
+		});
+	}
+
+	function rotate(args, callback){
+		app.api.post('api-token/' + args.id + '/rotate', {}, function(error, data){
+			callback(error, data);
+		});
+	}
+
+	return { list, add, update, remove, rotate };
+})(app);
+
 app.impersonate = (function(app){
 	function create(uid, callack){
 		app.api.post('auth/impersonate/' + uid, {}, function(error, data){