feat: milestone enhancements - new fields, task/support/meeting endpoints, progress

app/models/milestone.py

@@ -7,6 +7,9 @@ import enum
 
 class MilestoneStatus(str, enum.Enum):
     OPEN = "open"
+    PENDING = "pending"
+    DEFERRED = "deferred"
+    PROGRESSING = "progressing"
     CLOSED = "closed"
 
 
@@ -18,6 +21,9 @@ class Milestone(Base):
     description = Column(Text, nullable=True)
     status = Column(Enum(MilestoneStatus), default=MilestoneStatus.OPEN)
     due_date = Column(DateTime(timezone=True), nullable=True)
+    planned_release_date = Column(DateTime(timezone=True), nullable=True)
+    depend_on_milestones = Column(Text, nullable=True)  # JSON list of milestone codes
+    depend_on_tasks = Column(Text, nullable=True)  # JSON list of task IDs
     project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())