feat: OpsxDB 桌面数据库客户端首版入库

含工作台/连库多引擎字段与 SSH·SSL、结果编辑、Redis 键浏览、
Tauri 桌面与 docs/落地页；排除本地构建产物与 sidecar 二进制。

apps/server/internal/db/oracle.go

@@ -0,0 +1,145 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+	"net/url"
+
+	ora "github.com/sijms/go-ora/v2"
+)
+
+func openOracle(c ConnReq) (*sql.DB, error) {
+	host := c.Host
+	if host == "" {
+		host = "127.0.0.1"
+	}
+	port := c.Port
+	if port == 0 {
+		port = 1521
+	}
+	user := c.User
+	if user == "" {
+		user = "system"
+	}
+	service := c.Service
+	if service == "" {
+		if c.Database != "" {
+			service = c.Database
+		} else {
+			service = "XEPDB1"
+		}
+	}
+	dsn := fmt.Sprintf("oracle://%s:%s@%s:%d/%s", url.PathEscape(user), url.PathEscape(c.Password), host, port, service)
+	mode := EffectiveSSLMode(c)
+	if mode != "disable" {
+		q := url.Values{}
+		q.Set("SSL", "true")
+		if mode == "skip-verify" {
+			q.Set("SSL VERIFY", "false")
+		} else {
+			q.Set("SSL VERIFY", "true")
+		}
+		dsn = dsn + "?" + q.Encode()
+	}
+
+	tlsCfg, err := tlsConfigFrom(c)
+	if err != nil {
+		return nil, err
+	}
+	if tlsCfg != nil {
+		connector := ora.NewConnector(dsn)
+		oc, ok := connector.(*ora.OracleConnector)
+		if !ok {
+			return nil, fmt.Errorf("oracle: connector 类型异常")
+		}
+		oc.WithTLSConfig(tlsCfg)
+		return sql.OpenDB(oc), nil
+	}
+	return sql.Open("oracle", dsn)
+}
+
+func listDatabasesOracle(db *sql.DB) ([]string, error) {
+	// 返回当前用户可见 schema
+	rows, err := db.Query(`SELECT username FROM all_users ORDER BY username`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []string
+	for rows.Next() {
+		var name string
+		if err := rows.Scan(&name); err != nil {
+			return nil, err
+		}
+		out = append(out, name)
+	}
+	return out, rows.Err()
+}
+
+func listTablesOracle(db *sql.DB, schema string) ([]string, error) {
+	var (
+		rows *sql.Rows
+		err  error
+	)
+	if schema == "" {
+		rows, err = db.Query(`SELECT table_name FROM user_tables ORDER BY table_name`)
+	} else {
+		rows, err = db.Query(`SELECT table_name FROM all_tables WHERE owner = UPPER(:1) ORDER BY table_name`, schema)
+	}
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []string
+	for rows.Next() {
+		var name string
+		if err := rows.Scan(&name); err != nil {
+			return nil, err
+		}
+		out = append(out, name)
+	}
+	return out, rows.Err()
+}
+
+func listColumnsOracle(dbh *sql.DB, schema, table string) ([]ColumnInfo, error) {
+	owner, t := splitSchemaTable(table)
+	if owner == "" {
+		owner = schema
+	}
+	var (
+		rows *sql.Rows
+		err  error
+	)
+	if owner == "" {
+		rows, err = dbh.Query(`
+			SELECT column_name, data_type, nullable, data_default
+			FROM user_tab_columns WHERE table_name = UPPER(:1)
+			ORDER BY column_id`, t)
+	} else {
+		rows, err = dbh.Query(`
+			SELECT column_name, data_type, nullable, data_default
+			FROM all_tab_columns WHERE owner = UPPER(:1) AND table_name = UPPER(:2)
+			ORDER BY column_id`, owner, t)
+	}
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []ColumnInfo
+	for rows.Next() {
+		var name, typ, nullable string
+		var def sql.NullString
+		if err := rows.Scan(&name, &typ, &nullable, &def); err != nil {
+			return nil, err
+		}
+		col := ColumnInfo{Name: name, Type: typ, Nullable: nullable == "Y"}
+		if def.Valid {
+			col.Default = def.String
+		}
+		out = append(out, col)
+	}
+	if out == nil {
+		out = []ColumnInfo{}
+	}
+	return out, rows.Err()
+}