feat: Phase 1 — 项目骨架搭建，集成 Gin、SQLite 和设置页面

database/db.go

@@ -0,0 +1,90 @@
+package database
+
+import (
+	"database/sql"
+	"log"
+
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/HoHD/PR-Helper/models"
+)
+
+type DB struct {
+	conn *sql.DB
+}
+
+func New(dbPath string) (*DB, error) {
+	conn, err := sql.Open("sqlite3", dbPath+"?_journal_mode=WAL&_busy_timeout=5000")
+	if err != nil {
+		return nil, err
+	}
+	db := &DB{conn: conn}
+	if err := db.migrate(); err != nil {
+		return nil, err
+	}
+	if err := db.seedDefaults(); err != nil {
+		return nil, err
+	}
+	return db, nil
+}
+
+func (db *DB) Close() error {
+	return db.conn.Close()
+}
+
+func (db *DB) Conn() *sql.DB {
+	return db.conn
+}
+
+func (db *DB) migrate() error {
+	stmts := []string{
+		`CREATE TABLE IF NOT EXISTS settings (
+			key   TEXT PRIMARY KEY,
+			value TEXT NOT NULL
+		)`,
+		`CREATE TABLE IF NOT EXISTS repositories (
+			id         INTEGER PRIMARY KEY AUTOINCREMENT,
+			url        TEXT NOT NULL UNIQUE,
+			local_path TEXT NOT NULL,
+			size_bytes INTEGER DEFAULT 0,
+			cloned_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
+			last_used  DATETIME DEFAULT CURRENT_TIMESTAMP
+		)`,
+		`CREATE TABLE IF NOT EXISTS analyses (
+			id          INTEGER PRIMARY KEY AUTOINCREMENT,
+			repo_id     INTEGER REFERENCES repositories(id),
+			type        TEXT NOT NULL,
+			base_ref    TEXT NOT NULL,
+			head_ref    TEXT NOT NULL,
+			result      TEXT,
+			created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
+		)`,
+		`CREATE TABLE IF NOT EXISTS review_notes (
+			id          INTEGER PRIMARY KEY AUTOINCREMENT,
+			analysis_id INTEGER REFERENCES analyses(id),
+			scope       TEXT NOT NULL,
+			scope_key   TEXT NOT NULL,
+			content     TEXT NOT NULL,
+			created_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
+			updated_at  DATETIME DEFAULT CURRENT_TIMESTAMP
+		)`,
+	}
+	for _, s := range stmts {
+		if _, err := db.conn.Exec(s); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (db *DB) seedDefaults() error {
+	for key, val := range models.DefaultSettings {
+		_, err := db.conn.Exec(
+			`INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)`, key, val,
+		)
+		if err != nil {
+			log.Printf("warning: failed to seed setting %s: %v", key, err)
+		}
+	}
+	return nil
+}