feat: add issue labels (DB schema, API, and service)

New labels and issue_labels tables with cascade deletes, unique
per-company name constraint. CRUD routes for labels, label filtering
on issue list, and label sync on issue create/update. All issue
responses now include labels array.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/shared/src/index.ts

@@ -6,6 +6,7 @@ export {
   AGENT_STATUSES,
   AGENT_ADAPTER_TYPES,
   AGENT_ROLES,
+  AGENT_ICON_NAMES,
   ISSUE_STATUSES,
   ISSUE_PRIORITIES,
   GOAL_LEVELS,
@@ -36,6 +37,7 @@ export {
   type AgentStatus,
   type AgentAdapterType,
   type AgentRole,
+  type AgentIconName,
   type IssueStatus,
   type IssuePriority,
   type GoalLevel,
@@ -73,9 +75,11 @@ export type {
   AssetImage,
   Project,
   ProjectGoalRef,
+  ProjectWorkspace,
   Issue,
   IssueComment,
   IssueAttachment,
+  IssueLabel,
   Goal,
   Approval,
   ApprovalComment,
@@ -126,15 +130,21 @@ export {
   type UpdateAgentPermissions,
   createProjectSchema,
   updateProjectSchema,
+  createProjectWorkspaceSchema,
+  updateProjectWorkspaceSchema,
   type CreateProject,
   type UpdateProject,
+  type CreateProjectWorkspace,
+  type UpdateProjectWorkspace,
   createIssueSchema,
+  createIssueLabelSchema,
   updateIssueSchema,
   checkoutIssueSchema,
   addIssueCommentSchema,
   linkIssueApprovalSchema,
   createIssueAttachmentMetadataSchema,
   type CreateIssue,
+  type CreateIssueLabel,
   type UpdateIssue,
   type CheckoutIssue,
   type AddIssueComment,