feat: 实现社区激励金（公户）系统，经济闭环

- 新增 CommunityFund / FundLog 模型（公户余额单行表 + 6种流水类型）
- 新增 FundRepo 仓储（GetBalance / IncrBalance / CreateLog / ListLogs / WithTx）
- 改造 EnergyService 五个方法：Energize 税收入公户、DeductOnRename/DeductOnDeletePost 入公户、RefundOnRenameReject 从公户支出、AdminAdjust 拆分为 admin_transfer/system_operation
- 新增 ErrInsufficientFund 错误哨兵
- 管理后台新增公户余额展示 + 公户流水页面 + 域能调整资金来源选择
- 新增 energy.css / energy.js 前端交互
- 侧边栏新增公户流水入口

templates/admin/html/energy/fund_logs.html

@@ -0,0 +1,30 @@
+{{template "admin/layout/base.html" .}}
+        <div class="page-header">
+            <h1>公户流水</h1>
+            <p class="page-desc">查看社区激励金（公户）的全部收支记录</p>
+        </div>
+
+        <div class="filter-bar">
+            <label for="fund-log-type-filter" style="font-size:0.85rem;color:#4a5568;font-weight:500;">类型筛选：</label>
+            <select id="fund-log-type-filter">
+                <option value="">全部类型</option>
+                {{range $type, $name := .LogTypes}}<option value="{{$type}}">{{$name}}</option>{{end}}
+            </select>
+        </div>
+
+        <table class="log-table">
+            <thead>
+                <tr>
+                    <th>ID</th>
+                    <th>时间</th>
+                    <th>变动</th>
+                    <th>类型</th>
+                    <th>说明</th>
+                </tr>
+            </thead>
+            <tbody id="fund-log-tbody">
+            </tbody>
+        </table>
+
+        <div id="fund-log-pagination" class="pagination"></div>
+{{template "admin/layout/footer.html" .}}

templates/admin/html/energy/index.html

@@ -1,2 +1,44 @@
 {{template "admin/layout/base.html" .}}
+        <div class="page-header">
+            <h1>域能管理</h1>
+            <p class="page-desc">管理公户余额与用户域能调整</p>
+        </div>
+
+        <div class="fund-card">
+            <div class="fund-info">
+                <h3>公户余额</h3>
+                <p id="fund-balance" class="fund-balance{{if lt .FundBalance 0}} negative{{end}}">{{printf "%.1f" .FundBalanceDisplay}}</p>
+            </div>
+            <div class="fund-icon">
+                <svg viewBox="0 0 24 24" fill="currentColor" width="48" height="48"><path d="M12 1v4M12 19v4M4.22 4.22l2.83 2.83M16.95 16.95l2.83 2.83M1 12h4M19 12h4M4.22 19.78l2.83-2.83M16.95 7.05l2.83-2.83"/></svg>
+            </div>
+        </div>
+
+        <div class="adjust-form">
+            <h3>调整用户域能</h3>
+            <form id="adjust-form">
+                <div class="form-group">
+                    <label for="user_ids">目标用户 UID（多个用英文逗号分隔）</label>
+                    <input type="text" id="user_ids" name="user_ids" placeholder="例如：1,2,3" required>
+                </div>
+                <div class="form-group">
+                    <label for="amount">调整金额（正数为增加，负数为扣减，×10存储）</label>
+                    <input type="number" id="amount" name="amount" placeholder="例如：10 表示 +1.0 域能" required>
+                    <div class="form-hint">存储单位 ×10：输入 10 = +1.0 域能，输入 -5 = -0.5 域能</div>
+                </div>
+                <div class="form-group">
+                    <label for="adjust-mode">资金来源</label>
+                    <select id="adjust-mode" name="mode">
+                        <option value="admin_transfer">公户转出（受余额约束）</option>
+                        {{if .IsOwner}}<option value="system_operation">系统操作（不受余额约束，仅站长可用）</option>{{end}}
+                    </select>
+                </div>
+                <div class="form-group">
+                    <label for="description">操作说明</label>
+                    <textarea id="description" name="description" placeholder="简要说明调整原因" required maxlength="500"></textarea>
+                </div>
+                <button type="submit" class="btn-primary">确认调整</button>
+                <div id="adjust-message" class="form-message"></div>
+            </form>
+        </div>
 {{template "admin/layout/footer.html" .}}

templates/admin/html/energy/logs.html

@@ -1,2 +1,31 @@
 {{template "admin/layout/base.html" .}}
+        <div class="page-header">
+            <h1>域能日志</h1>
+            <p class="page-desc">查看所有用户的域能流水记录</p>
+        </div>
+
+        <div class="filter-bar">
+            <label for="log-type-filter" style="font-size:0.85rem;color:#4a5568;font-weight:500;">类型筛选：</label>
+            <select id="log-type-filter">
+                <option value="">全部类型</option>
+                {{range $type, $name := .LogTypes}}<option value="{{$type}}">{{$name}}</option>{{end}}
+            </select>
+        </div>
+
+        <table class="log-table">
+            <thead>
+                <tr>
+                    <th>ID</th>
+                    <th>时间</th>
+                    <th>用户UID</th>
+                    <th>变动</th>
+                    <th>类型</th>
+                    <th>说明</th>
+                </tr>
+            </thead>
+            <tbody id="energy-log-tbody">
+            </tbody>
+        </table>
+
+        <div id="energy-log-pagination" class="pagination"></div>
 {{template "admin/layout/footer.html" .}}