fix: make product copy direct and factual

The website, README, and Smart Heartbeat interface used promotional superlatives, generic benefit labels, and personified growth language that obscured the actual product behavior. The English README is now the repository entry point with a separate Chinese version, and both website and in-app copy describe concrete capabilities, reports, suggestions, and execution boundaries.

Release note: 优化官网、README 与智能心跳界面的中英文文案，去除空泛宣传和拟人化表达，改为直接说明产品能力、运行记录与建议内容。

sites/en.html

@@ -5,14 +5,14 @@
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta
       name="description"
-      content="GoodBuddy is an all-in-one desktop AI assistant that requires no GoodBuddy account, with a unified Agent Runtime for direct models, OpenCode, Continue, and DeepSeek Harness."
+      content="GoodBuddy is an open-source desktop AI assistant for model chat, coding agents, knowledge, notes, and scheduled work. No GoodBuddy account is required."
     />
     <link rel="canonical" href="https://mesalogo.github.io/goodbuddy/en.html" />
     <link rel="alternate" hreflang="zh-CN" href="https://mesalogo.github.io/goodbuddy/" />
     <link rel="alternate" hreflang="en" href="https://mesalogo.github.io/goodbuddy/en.html" />
     <link rel="alternate" hreflang="x-default" href="https://mesalogo.github.io/goodbuddy/en.html" />
     <meta name="theme-color" content="#f6f8fb" />
-    <title>GoodBuddy | All-in-one AI assistant, no account required</title>
+    <title>GoodBuddy | Open-source desktop AI assistant</title>
     <link
       rel="icon"
       href="./assets/goodbuddy-light.png"
@@ -120,13 +120,12 @@
             </div>
             <h1 id="hero-title">
               No account required.<br />
-              Your all-in-one<br />
-              <span>AI assistant.</span>
+              Model chat and coding agents<br />
+              <span>on your desktop.</span>
             </h1>
             <p class="hero-lead">
-              GoodBuddy brings conversations, knowledge, notes, and tasks together in a desktop
-              assistant and AI coding workspace. Its unified Agent Runtime connects direct models,
-              OpenCode, Continue, and DeepSeek Harness without repeated command-line setup.
+              GoodBuddy manages conversations, knowledge, notes, and tasks on the desktop.
+              Its Agent Runtime connects direct models, OpenCode, Continue, and DeepSeek Harness.
             </p>
             <div class="hero-actions">
               <a class="button button--primary" href="#download">Download now</a>
@@ -290,11 +289,11 @@
         <div class="section-inner">
           <div class="section-heading">
             <div>
-              <p class="kicker">Unified Agent Runtime</p>
-              <h2 id="features-title">Different tools, one workflow</h2>
+              <p class="kicker">Agent Runtime</p>
+              <h2 id="features-title">Agent Runtimes in one desktop interface</h2>
             </div>
             <p>
-              Bring Runtime selection, model connections, Skills, MCP, and permissions into one desktop interface.
+              Configure Runtime selection, model connections, Skills, MCP, and work modes on the desktop.
             </p>
           </div>
 
@@ -334,8 +333,8 @@
                 </svg>
               </div>
               <span class="feature-number">03</span>
-              <h3>Lower setup overhead</h3>
-              <p>Select the Runtime, model, work mode, and project in a graphical interface instead of memorizing commands.</p>
+              <h3>Runtime setup in the desktop app</h3>
+              <p>Select the Runtime, model, work mode, and project in the desktop interface.</p>
             </article>
 
             <article class="feature-card">
@@ -346,7 +345,7 @@
                 </svg>
               </div>
               <span class="feature-number">04</span>
-              <h3>Shared capabilities, preserved boundaries</h3>
+              <h3>Runtime-specific capabilities and work modes</h3>
               <p>Skills, MCP, and tools follow each Runtime. Ask stays read-only, while Execute remains approval-controlled and auditable.</p>
               <div class="mode-row" aria-label="Two work modes">
                 <span>Ask <small>Read-only</small></span>
@@ -374,7 +373,7 @@
                 </svg>
               </div>
               <span class="feature-number">06</span>
-              <h3>Trace every run from action to result</h3>
+              <h3>Run history and token usage</h3>
               <p>Review tool calls, cancellation, timeouts, token usage, and run history in one place.</p>
             </article>
           </div>
@@ -433,7 +432,7 @@
           </span>
           <span>GoodBuddy</span>
         </a>
-        <p>No account required. One AI assistant for everything.</p>
+        <p>Open-source desktop AI assistant. No account required.</p>
         <div class="footer-links">
           <a href="#download">Download</a>
           <a href="#features">Agent Runtime</a>