feat(phase1): OpenRouter采集器接入PostgreSQL，数据链路闭环

- 将 fetch_openrouter.go 的 summarize() 实现为 PostgreSQL upsert
- 新增 -db 参数和 DATABASE_URL 环境变量支持
- 打通 models + model_prices 表的最小可运行链路
- 创建 llm_intelligence 数据库并运行 migration
- 前端 Explorer 验证 T-3.2~T-3.5 全部通过
- 日报生成器正常产出 Markdown 和 latest_models.json

db/migrations/001_phase1_core_tables.sql

@@ -0,0 +1,59 @@
+-- Phase 1 PostgreSQL migration
+-- 三张核心表：models、model_prices、report_runs
+-- 对应 fetch_openrouter.go 采集器输出字段和日报生成器需求
+
+-- models：模型基础信息表
+CREATE TABLE IF NOT EXISTS models (
+    id                  BIGSERIAL PRIMARY KEY,
+    source              TEXT        NOT NULL DEFAULT 'openrouter',
+    external_id         TEXT        NOT NULL UNIQUE,
+    name                TEXT,
+    description         TEXT,
+    context_length      INTEGER,
+    capabilities        JSONB,                        -- JSONB 数组存储
+    created_at_source   BIGINT,                      -- OpenRouter created 字段（Unix 时间戳）
+    is_free             BOOLEAN     NOT NULL DEFAULT FALSE,
+    status              TEXT        NOT NULL DEFAULT 'active', -- active / deprecated / discontinued
+    raw_payload         JSONB,                       -- 完整原始 JSON
+    created_at          TIMESTAMP   NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at          TIMESTAMP   NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_models_external_id ON models(external_id);
+CREATE INDEX IF NOT EXISTS idx_models_source ON models(source);
+CREATE INDEX IF NOT EXISTS idx_models_status ON models(status);
+CREATE INDEX IF NOT EXISTS idx_models_is_free ON models(is_free);
+
+-- model_prices：模型定价表
+CREATE TABLE IF NOT EXISTS model_prices (
+    id                    BIGSERIAL PRIMARY KEY,
+    model_id              BIGINT     NOT NULL REFERENCES models(id) ON DELETE CASCADE,
+    source                TEXT       NOT NULL DEFAULT 'openrouter',
+    currency              TEXT       NOT NULL DEFAULT 'USD',
+    input_price_per_mtok  REAL,
+    output_price_per_mtok REAL,
+    effective_date        DATE,
+    source_url            TEXT,
+    created_at            TIMESTAMP  NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(model_id, source, currency, effective_date)
+);
+
+CREATE INDEX IF NOT EXISTS idx_prices_model_id ON model_prices(model_id);
+CREATE INDEX IF NOT EXISTS idx_prices_source ON model_prices(source);
+CREATE INDEX IF NOT EXISTS idx_prices_currency ON model_prices(currency);
+
+-- report_runs：日报运行记录表
+CREATE TABLE IF NOT EXISTS report_runs (
+    id              BIGSERIAL PRIMARY KEY,
+    source          TEXT       NOT NULL DEFAULT 'openrouter',
+    report_date     DATE       NOT NULL,
+    status          TEXT       NOT NULL DEFAULT 'pending', -- pending / generated / failed
+    summary_md      TEXT,
+    output_path     TEXT,
+    error_message   TEXT,
+    created_at      TIMESTAMP  NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_reports_source ON report_runs(source);
+CREATE INDEX IF NOT EXISTS idx_reports_report_date ON report_runs(report_date);
+CREATE INDEX IF NOT EXISTS idx_reports_status ON report_runs(status);