fix: delete agent 500 error + dynamic personality + deployment guide

- Fix delete agent 500: clean up FK records (agent_llm_logs, permissions,
  schedules, executions, team_members) and unbind goals/tasks before delete
- Remove hardcoded personality templates in Android, replace with dynamic
  system prompt generation from name + description
- Set promptSectionsEnabled=false to bypass PromptComposer for personality
- Add Tencent Cloud Linux deployment guide (Docker Compose)
- Accumulated backend service updates, frontend UI fixes, Android app changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/data/create_node_templates_table.sql

@@ -0,0 +1,25 @@
+-- 创建节点模板表
+CREATE TABLE IF NOT EXISTS `node_templates` (
+  `id` CHAR(36) NOT NULL PRIMARY KEY COMMENT '模板ID',
+  `name` VARCHAR(100) NOT NULL COMMENT '模板名称',
+  `description` TEXT COMMENT '模板描述',
+  `category` VARCHAR(50) COMMENT '分类: text_generation/data_analysis/code_generation/translation/summarization/qa/other',
+  `tags` JSON COMMENT '标签列表',
+  `prompt` TEXT NOT NULL COMMENT '提示词模板（支持变量占位符，如 {{variable}}）',
+  `variables` JSON COMMENT '变量定义列表',
+  `provider` VARCHAR(50) DEFAULT 'deepseek' COMMENT '默认LLM提供商',
+  `model` VARCHAR(100) DEFAULT 'deepseek-chat' COMMENT '默认模型',
+  `temperature` VARCHAR(10) DEFAULT '0.7' COMMENT '默认温度参数',
+  `max_tokens` INT DEFAULT 1500 COMMENT '默认最大token数',
+  `is_public` BOOLEAN DEFAULT FALSE COMMENT '是否公开',
+  `is_featured` BOOLEAN DEFAULT FALSE COMMENT '是否精选',
+  `use_count` INT DEFAULT 0 COMMENT '使用次数',
+  `user_id` CHAR(36) NOT NULL COMMENT '创建者ID',
+  `created_at` DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `updated_at` DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE,
+  INDEX `idx_user_id` (`user_id`),
+  INDEX `idx_category` (`category`),
+  INDEX `idx_is_public` (`is_public`),
+  INDEX `idx_is_featured` (`is_featured`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='节点模板表';