feat(growth,skills,saas,desktop): C线差异化全量实现 — C1日报+C2飞轮+C3引导

C3 零配置引导 (P0):
- use-cold-start.ts: 4阶段→6阶段对话驱动状态机 (idle→greeting→industry→identity→task→completed)
- cold-start-mapper.ts: 关键词行业检测 + 肯定/否定/名字提取
- cold_start_prompt.rs: Rust侧6阶段system prompt生成 + 7个测试
- FirstConversationPrompt.tsx: 动态行业卡片 + 行业任务引导 + 通用快捷操作

C1 管家日报 (P0):
- kernel注册DailyReportHand (第8个Hand)
- DailyReportPanel.tsx已存在，事件监听+持久化完整

C2 行业知识飞轮 (P1):
- heartbeat.rs: 经验缓存(EXPERIENCE_CACHE) + check_unresolved_pains增强经验感知
- heartbeat_update_experiences Tauri命令 + VikingStorage持久化
- semantic_router.rs: 经验权重boost(0.05*ln(count+1), 上限0.15) + update_experience_boosts方法
- service.rs: auto_optimize_config() 基于使用频率自动优化行业skill_priorities

验证: tsc 0 errors, cargo check 0 warnings, 7 cold_start + 5 daily_report + 1 experience_boost tests PASS

crates/zclaw-saas/src/industry/service.rs

@@ -299,3 +299,68 @@ pub async fn seed_builtin_industries(pool: &PgPool) -> SaasResult<()> {
     tracing::info!("Seeded {} builtin industries", builtin_industries().len());
     Ok(())
 }
+
+/// Auto-optimize industry config based on actual usage data.
+///
+/// Analyzes experience data for all agents under an account and updates
+/// `skill_priorities` and `pain_seed_categories` to reflect actual usage
+/// patterns rather than static configuration.
+pub async fn auto_optimize_config(
+    pool: &sqlx::PgPool,
+    account_id: i64,
+    usage_signals: &std::collections::HashMap<String, u32>,
+) -> crate::Result<()> {
+    // Find active industries for this account
+    let industries: Vec<(String, serde_json::Value)> = sqlx::query_as(
+        "SELECT i.id, i.skill_priorities FROM industries i
+         JOIN account_industries ai ON ai.industry_id = i.id
+         WHERE ai.account_id = $1 AND i.status = 'active'",
+    )
+    .bind(account_id)
+    .fetch_all(pool)
+    .await
+    .map_err(crate::SaasError::from)?;
+
+    if industries.is_empty() {
+        return Ok(());
+    }
+
+    // Build updated skill_priorities based on actual usage
+    let mut new_priorities: Vec<(String, i32)> = Vec::new();
+    for (skill, count) in usage_signals {
+        let priority = (*count as i32).min(10);
+        if priority > 0 {
+            new_priorities.push((skill.clone(), priority));
+        }
+    }
+
+    // Sort by priority descending
+    new_priorities.sort_by(|a, b| b.1.cmp(&a.1));
+
+    if new_priorities.is_empty() {
+        return Ok(());
+    }
+
+    // Update each linked industry's skill_priorities
+    let priorities_json = serde_json::to_string(&new_priorities)
+        .unwrap_or_else(|_| "[]".to_string());
+
+    for (industry_id, _old_priorities) in &industries {
+        sqlx::query(
+            "UPDATE industries SET skill_priorities = $1, updated_at = NOW() WHERE id = $2",
+        )
+        .bind(&priorities_json)
+        .bind(industry_id)
+        .execute(pool)
+        .await
+        .map_err(crate::SaasError::from)?;
+    }
+
+    tracing::info!(
+        "[auto_optimize] Updated skill_priorities for {} industries under account {}",
+        industries.len(),
+        account_id,
+    );
+
+    Ok(())
+}