refactor(application): redesign exception hierarchy with flexible base class

- Replace DEXJobException with JobException base class
  - Flexible params-based detail collection
  - Automatic message formatting with visual separators
  - Optional null-handling for contextual details
- Add JobHttpException for HTTP client failures
  - Properties: ClientLibrary, ClientMethod
  - Use case: ReC API, REST requests
- Add JobSqlException for SQL query failures
  - Property: Query (virtual for customization)
  - Use case: Main/Check query execution
- Comprehensive XML documentation for all exception classes

ECMJobRunner.Application/Common/Exceptions/JobException.cs

@@ -0,0 +1,91 @@
+using System;
+using System.Collections.Generic;
+
+namespace ECMJobRunner.Application.Common.Exceptions
+{
+    /// <summary>
+    /// Base exception class for job execution failures
+    /// Provides a flexible structure for capturing job context and detailed error information
+    /// </summary>
+    public class JobException : Exception
+    {
+        /// <summary>
+        /// Initializes a new instance of JobException with detailed context information
+        /// </summary>
+        /// <param name="jobName">Name of the job that failed (e.g., "SQL Main Query", "ReC Request")</param>
+        /// <param name="processName">Name of the process/stage being executed (e.g., "MainQueryExecution", "CheckQueryValidation")</param>
+        /// <param name="batchId">Unique batch identifier for tracking the execution</param>
+        /// <param name="reason">Human-readable reason for the failure (nullable)</param>
+        /// <param name="innerException">The underlying exception that caused the failure (nullable)</param>
+        /// <param name="details">Additional contextual details as name-value pairs with optional null-handling</param>
+        /// <remarks>
+        /// The details parameter accepts tuples with:
+        /// - Name: Display name of the detail
+        /// - Value: String value of the detail (nullable)
+        /// - IgnoreIfNull: If true, the detail is omitted from the message when value is null
+        /// </remarks>
+        public JobException(string jobName, string processName, string batchId, string? reason, Exception? innerException, params (string Name, string? Value, bool IgnoreIfNull)[] details) 
+            : base(
+                  Message(jobName,
+                  [
+                      ("Process Name", processName, false),
+                      ("Batch Id", batchId, false),
+                      ("Reason", reason, true),
+                      ..details
+                  ]),
+                  innerException)
+        {
+            JobName = jobName;
+            ProcessName = processName;
+            BatchId = batchId;
+        }
+
+        /// <summary>
+        /// Gets the name of the job that failed
+        /// </summary>
+        public string JobName { get; }
+
+        /// <summary>
+        /// Gets the name of the process/stage that was being executed when the failure occurred
+        /// </summary>
+        public string ProcessName { get; }
+
+        /// <summary>
+        /// Gets the unique batch identifier for tracking the execution
+        /// </summary>
+        public string BatchId { get; }
+
+        /// <summary>
+        /// Generates a formatted error message with job context and details
+        /// </summary>
+        /// <param name="jobName">Name of the job that failed</param>
+        /// <param name="details">Collection of name-value pairs with optional null-handling</param>
+        /// <returns>Formatted multi-line error message with visual separators</returns>
+        /// <remarks>
+        /// Message format:
+        /// <code>
+        /// {jobName} could not be completed.
+        /// ─────────────────────────────────────────
+        ///   Process Name: {processName}
+        ///   Batch Id: {batchId}
+        ///   {additional details...}
+        /// ─────────────────────────────────────────
+        /// </code>
+        /// Details with IgnoreIfNull=true are omitted when their value is null.
+        /// </remarks>
+        internal static string Message(string jobName, IEnumerable<(string Name, string? Value, bool IgnoreIfNull)> details)
+        {
+            var message = new System.Text.StringBuilder();
+            message.AppendLine($"{jobName} could not be completed.");
+            message.AppendLine("─────────────────────────────────────────");
+            foreach (var (name, value, ignoreNullValue) in details)
+            {
+                if (ignoreNullValue && value is null)
+                    continue;
+                message.AppendLine($"  {name}: {value}");
+            }
+            message.AppendLine("─────────────────────────────────────────");
+            return message.ToString();
+        }
+    }
+}