feat: Add PlayerManagement GM interface and clean repository

- Add comprehensive PlayerManagement component for GMs
- Add all GM API endpoints for player CRUD operations
- Add comprehensive test suite with 14 tests
- Clean up .gitignore to exclude logs, backups, core dumps
- Update README with setup instructions and documentation
- Add setup.sh script for easy project initialization

This provides a complete GM interface for managing players without
the large files that were blocking the previous push.

src/App.js

@@ -5,6 +5,7 @@ import PlayerTab from './components/PlayerTab';
 import RulesTab from './components/RulesTab';
 import BestiaryTab from './components/BestiaryTab';
 import GMKit from './components/GMKit';
+import PlayerManagement from './components/PlayerManagement';
 import { useState, useEffect } from 'react';
 import axios from 'axios';
 import { debug, info, warn, error, logApiCall, logApiError, logUserAction } from './utils/logger';
@@ -266,6 +267,12 @@ function App() {
                 >
                   Bestiary
                 </button>
+                <button 
+                  className={`px-4 py-2 rounded-lg font-medium transition-all ${tab==='players' ? 'bg-blue-600 text-white shadow-lg' : 'bg-slate-700/50 text-slate-200 hover:bg-slate-600/50'}`} 
+                  onClick={()=>{logUserAction('navigation', 'Tab switch', { from: tab, to: 'players' }); setTab('players')}}
+                >
+                  Player Management
+                </button>
                 <button 
                   className={`px-4 py-2 rounded-lg font-medium transition-all ${tab==='gmkit' ? 'bg-blue-600 text-white shadow-lg' : 'bg-slate-700/50 text-slate-200 hover:bg-slate-600/50'}`} 
                   onClick={()=>{logUserAction('navigation', 'Tab switch', { from: tab, to: 'gmkit' }); setTab('gmkit')}}
@@ -311,7 +318,7 @@ function App() {
           </div>
         )}
         
-  {tab==='roller' ? <DeathwatchRoller /> : tab==='shop' ? <RequisitionShop authedPlayer={authedPlayer} sessionId={sessionId} /> : tab==='rules' ? <RulesTab authedPlayer={authedPlayer} sessionId={sessionId} /> : tab==='bestiary' ? (authedPlayer === 'gm' ? <BestiaryTab /> : <div className="p-6 rounded-lg bg-red-900/20 border border-red-500/30"><h2 className="text-xl font-bold text-red-300 mb-2">Access Denied</h2><p className="text-red-200">The Bestiary is only accessible to Game Masters. Please log in with a GM account.</p></div>) : tab==='gmkit' ? <GMKit authedPlayer={authedPlayer} /> : <PlayerTab 
+  {tab==='roller' ? <DeathwatchRoller /> : tab==='shop' ? <RequisitionShop authedPlayer={authedPlayer} sessionId={sessionId} /> : tab==='rules' ? <RulesTab authedPlayer={authedPlayer} sessionId={sessionId} /> : tab==='bestiary' ? (authedPlayer === 'gm' ? <BestiaryTab /> : <div className="p-6 rounded-lg bg-red-900/20 border border-red-500/30"><h2 className="text-xl font-bold text-red-300 mb-2">Access Denied</h2><p className="text-red-200">The Bestiary is only accessible to Game Masters. Please log in with a GM account.</p></div>) : tab==='players' ? <PlayerManagement authedPlayer={authedPlayer} sessionId={sessionId} /> : tab==='gmkit' ? <GMKit authedPlayer={authedPlayer} /> : <PlayerTab 
           authedPlayer={authedPlayer} 
           sessionId={sessionId}
         />}