chore: 初始化 eightbf-analysis-go（对齐 Java 会商作业服务）

Go 实现 /api/v1/analysis 契约、Demo/Live Worker、DeerFlow SSE；含设计文档与冒烟脚本。

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/config/config.go

@@ -0,0 +1,144 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+// Config 运行配置（环境变量优先，与 Java EBA_* / analysis.* 对齐）。
+type Config struct {
+	Port int
+
+	// MySQL：优先 EBA_DB_DSN；否则用 HOST/PORT/NAME/USER/PASSWORD 拼，或解析 JDBC URL。
+	DBDSN string
+
+	AnalysisMode string // live | demo
+	AuthEnabled  bool
+	DemoEnabled  bool
+	LivePollMS   int
+	DemoTickMS   int
+
+	DeerFlowBaseURL           string
+	DeerFlowUser              string
+	DeerFlowPassword          string
+	DeerFlowCoordinator       string
+	DeerFlowStreamIdleTimeout int // 毫秒
+}
+
+// Load 从环境变量加载；缺省贴近本机联调。
+func Load() Config {
+	c := Config{
+		Port:                      envInt("SERVER_PORT", 18097),
+		AnalysisMode:              env("ANALYSIS_MODE", "live"),
+		AuthEnabled:               envBool("ANALYSIS_AUTH_ENABLED", false),
+		DemoEnabled:               envBool("EBA_WORKER_DEMO_ENABLED", false),
+		LivePollMS:                envInt("EBA_WORKER_LIVE_POLL_MS", 1000),
+		DemoTickMS:                envInt("EBA_WORKER_TICK_MS", 400),
+		DeerFlowBaseURL:           strings.TrimRight(env("EBA_DF_BASE_URL", "http://127.0.0.1:8001"), "/"),
+		DeerFlowUser:              env("EBA_DF_USER", "admin"),
+		DeerFlowPassword:          env("EBA_DF_PASSWORD", "123ewq"),
+		DeerFlowCoordinator:       env("EBA_DF_COORDINATOR", "roundtable-coordinator"),
+		DeerFlowStreamIdleTimeout: envInt("EBA_DF_STREAM_IDLE_TIMEOUT_MS", 180000),
+	}
+	c.DBDSN = resolveDSN()
+	// live 默认关掉 demo；显式 ANALYSIS_MODE=demo 时打开假进度
+	if c.AnalysisMode == "demo" {
+		c.DemoEnabled = true
+	}
+	if c.AnalysisMode == "live" && !envExplicit("EBA_WORKER_DEMO_ENABLED") {
+		c.DemoEnabled = false
+	}
+	return c
+}
+
+func resolveDSN() string {
+	if d := strings.TrimSpace(os.Getenv("EBA_DB_DSN")); d != "" {
+		return ensureMultiStatements(d)
+	}
+	user := env("EBA_DB_USER", "eba")
+	pass := env("EBA_DB_PASSWORD", "eba_local_dev")
+	jdbc := strings.TrimSpace(os.Getenv("EBA_DB_URL"))
+	if jdbc != "" {
+		if dsn, ok := jdbcToDSN(jdbc, user, pass); ok {
+			return dsn
+		}
+	}
+	host := env("EBA_DB_HOST", "127.0.0.1")
+	port := env("EBA_DB_PORT", "3306")
+	name := env("EBA_DB_NAME", "eightbf_analysis")
+	return user + ":" + pass + "@tcp(" + host + ":" + port + ")/" + name +
+		"?parseTime=true&loc=Asia%2FShanghai&charset=utf8mb4&multiStatements=true"
+}
+
+// jdbcToDSN 把 Java 的 jdbc:mysql://host:port/db?... 转成 Go driver DSN。
+func jdbcToDSN(jdbc, user, pass string) (string, bool) {
+	s := strings.TrimPrefix(jdbc, "jdbc:mysql://")
+	if s == jdbc {
+		return "", false
+	}
+	hostPath := s
+	query := ""
+	if i := strings.Index(s, "?"); i >= 0 {
+		hostPath = s[:i]
+		query = s[i+1:]
+	}
+	host := hostPath
+	db := "eightbf_analysis"
+	if i := strings.Index(hostPath, "/"); i >= 0 {
+		host = hostPath[:i]
+		db = hostPath[i+1:]
+	}
+	params := "parseTime=true&loc=Asia%2FShanghai&charset=utf8mb4&multiStatements=true"
+	_ = query // Java JDBC 专用参数不照搬
+	return user + ":" + pass + "@tcp(" + host + ")/" + db + "?" + params, true
+}
+
+func ensureMultiStatements(dsn string) string {
+	if strings.Contains(dsn, "multiStatements=") {
+		return dsn
+	}
+	if strings.Contains(dsn, "?") {
+		return dsn + "&multiStatements=true"
+	}
+	return dsn + "?multiStatements=true"
+}
+
+func env(k, def string) string {
+	if v := strings.TrimSpace(os.Getenv(k)); v != "" {
+		return v
+	}
+	return def
+}
+
+func envExplicit(k string) bool {
+	_, ok := os.LookupEnv(k)
+	return ok
+}
+
+func envBool(k string, def bool) bool {
+	v := strings.TrimSpace(os.Getenv(k))
+	if v == "" {
+		return def
+	}
+	switch strings.ToLower(v) {
+	case "1", "true", "yes", "on":
+		return true
+	case "0", "false", "no", "off":
+		return false
+	default:
+		return def
+	}
+}
+
+func envInt(k string, def int) int {
+	v := strings.TrimSpace(os.Getenv(k))
+	if v == "" {
+		return def
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return def
+	}
+	return n
+}