feat: complete issue fixes and implement remaining features

## Critical Issues (CRIT-001~003) - All Fixed
- JWT secret key validation with pydantic field_validator
- Login audit logging for success/failure attempts
- Frontend API path prefix removal

## High Priority Issues (HIGH-001~008) - All Fixed
- Project soft delete using is_active flag
- Redis session token bytes handling
- Rate limiting with slowapi (5 req/min for login)
- Attachment API permission checks
- Kanban view with drag-and-drop
- Workload heatmap UI (WorkloadPage, WorkloadHeatmap)
- TaskDetailModal integrating Comments/Attachments
- UserSelect component for task assignment

## Medium Priority Issues (MED-001~012) - All Fixed
- MED-001~005: DB commits, N+1 queries, datetime, error format, blocker flag
- MED-006: Project health dashboard (HealthService, ProjectHealthPage)
- MED-007: Capacity update API (PUT /api/users/{id}/capacity)
- MED-008: Schedule triggers (cron parsing, deadline reminders)
- MED-009: Watermark feature (image/PDF watermarking)
- MED-010~012: useEffect deps, DOM operations, PDF export

## New Files
- backend/app/api/health/ - Project health API
- backend/app/services/health_service.py
- backend/app/services/trigger_scheduler.py
- backend/app/services/watermark_service.py
- backend/app/core/rate_limiter.py
- frontend/src/pages/ProjectHealthPage.tsx
- frontend/src/components/ProjectHealthCard.tsx
- frontend/src/components/KanbanBoard.tsx
- frontend/src/components/WorkloadHeatmap.tsx

## Tests
- 113 new tests passing (health: 32, users: 14, triggers: 35, watermark: 32)

## OpenSpec Archives
- add-project-health-dashboard
- add-capacity-update-api
- add-schedule-triggers
- add-watermark-feature
- add-rate-limiting
- enhance-frontend-ux
- add-resource-management-ui

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -18,6 +18,7 @@ from app.models.trigger import Trigger, TriggerType
 from app.models.trigger_log import TriggerLog, TriggerLogStatus
 from app.models.scheduled_report import ScheduledReport, ReportType
 from app.models.report_history import ReportHistory, ReportHistoryStatus
+from app.models.project_health import ProjectHealth, RiskLevel, ScheduleStatus, ResourceStatus
 
 __all__ = [
     "User", "Role", "Department", "Space", "Project", "TaskStatus", "Task", "WorkloadSnapshot",
@@ -25,5 +26,6 @@ __all__ = [
     "AuditLog", "AuditAlert", "AuditAction", "SensitivityLevel", "EVENT_SENSITIVITY", "ALERT_EVENTS",
     "Attachment", "AttachmentVersion",
     "Trigger", "TriggerType", "TriggerLog", "TriggerLogStatus",
-    "ScheduledReport", "ReportType", "ReportHistory", "ReportHistoryStatus"
+    "ScheduledReport", "ReportType", "ReportHistory", "ReportHistoryStatus",
+    "ProjectHealth", "RiskLevel", "ScheduleStatus", "ResourceStatus"
 ]

backend/app/models/notification.py

@@ -13,6 +13,8 @@ class NotificationType(str, enum.Enum):
     STATUS_CHANGE = "status_change"
     COMMENT = "comment"
     BLOCKER_RESOLVED = "blocker_resolved"
+    DEADLINE_REMINDER = "deadline_reminder"
+    SCHEDULED_TRIGGER = "scheduled_trigger"
 
 
 class Notification(Base):
@@ -22,6 +24,7 @@ class Notification(Base):
     user_id = Column(String(36), ForeignKey("pjctrl_users.id", ondelete="CASCADE"), nullable=False)
     type = Column(
         Enum("mention", "assignment", "blocker", "status_change", "comment", "blocker_resolved",
+             "deadline_reminder", "scheduled_trigger",
              name="notification_type_enum"),
         nullable=False
     )

backend/app/models/project.py

@@ -39,3 +39,4 @@ class Project(Base):
     task_statuses = relationship("TaskStatus", back_populates="project", cascade="all, delete-orphan")
     tasks = relationship("Task", back_populates="project", cascade="all, delete-orphan")
     triggers = relationship("Trigger", back_populates="project", cascade="all, delete-orphan")
+    health = relationship("ProjectHealth", back_populates="project", uselist=False, cascade="all, delete-orphan")

backend/app/models/project_health.py

@@ -0,0 +1,51 @@
+from sqlalchemy import Column, String, Integer, DateTime, Enum, ForeignKey
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from app.core.database import Base
+import enum
+
+
+class RiskLevel(str, enum.Enum):
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+    CRITICAL = "critical"
+
+
+class ScheduleStatus(str, enum.Enum):
+    ON_TRACK = "on_track"
+    AT_RISK = "at_risk"
+    DELAYED = "delayed"
+
+
+class ResourceStatus(str, enum.Enum):
+    ADEQUATE = "adequate"
+    CONSTRAINED = "constrained"
+    OVERLOADED = "overloaded"
+
+
+class ProjectHealth(Base):
+    __tablename__ = "pjctrl_project_health"
+
+    id = Column(String(36), primary_key=True)
+    project_id = Column(String(36), ForeignKey("pjctrl_projects.id", ondelete="CASCADE"), nullable=False, unique=True)
+    health_score = Column(Integer, default=100, nullable=False)  # 0-100
+    risk_level = Column(
+        Enum("low", "medium", "high", "critical", name="risk_level_enum"),
+        default="low",
+        nullable=False
+    )
+    schedule_status = Column(
+        Enum("on_track", "at_risk", "delayed", name="schedule_status_enum"),
+        default="on_track",
+        nullable=False
+    )
+    resource_status = Column(
+        Enum("adequate", "constrained", "overloaded", name="resource_status_enum"),
+        default="adequate",
+        nullable=False
+    )
+    last_updated = Column(DateTime, server_default=func.now(), onupdate=func.now(), nullable=False)
+
+    # Relationships
+    project = relationship("Project", back_populates="health")

backend/app/models/user.py

@@ -10,6 +10,7 @@ class User(Base):
 
     id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
     email = Column(String(200), unique=True, nullable=False, index=True)
+    employee_id = Column(String(50), unique=True, nullable=True, index=True)
     name = Column(String(200), nullable=False)
     department_id = Column(String(36), ForeignKey("pjctrl_departments.id"), nullable=True)
     role_id = Column(String(36), ForeignKey("pjctrl_roles.id"), nullable=True)