feat: initial HarborForge project structure

- Docker Compose with MySQL + FastAPI backend
- Issue model with RESOLUTION type (for agent deadlock resolution)
- Project, User, Comment models
- Basic CRUD API endpoints
- .env.example for configuration

backend/app/models/models.py

@@ -0,0 +1,122 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum, Boolean
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from app.core.config import Base
+import enum
+
+
+class IssueType(str, enum.Enum):
+    TASK = "task"
+    STORY = "story"
+    TEST = "test"
+    RESOLUTION = "resolution"  # 决议案 - 用于 Agent 僵局提交
+
+
+class IssueStatus(str, enum.Enum):
+    OPEN = "open"
+    IN_PROGRESS = "in_progress"
+    RESOLVED = "resolved"
+    CLOSED = "closed"
+    BLOCKED = "blocked"
+
+
+class IssuePriority(str, enum.Enum):
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+    CRITICAL = "critical"
+
+
+class Issue(Base):
+    __tablename__ = "issues"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), nullable=False)
+    description = Column(Text, nullable=True)
+    issue_type = Column(Enum(IssueType), default=IssueType.TASK)
+    status = Column(Enum(IssueStatus), default=IssueStatus.OPEN)
+    priority = Column(Enum(IssuePriority), default=IssuePriority.MEDIUM)
+    
+    # Relationships
+    project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
+    reporter_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    assignee_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+    
+    # Resolution specific fields (for RESOLUTION type)
+    resolution_summary = Column(Text, nullable=True)  # 僵局摘要
+    positions = Column(Text, nullable=True)  # 各方立场 (JSON)
+    pending_matters = Column(Text, nullable=True)  # 待决事项
+    
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    
+    # Tags (comma-separated for simplicity)
+    tags = Column(String(500), nullable=True)
+    
+    # Dependencies
+    depends_on_id = Column(Integer, ForeignKey("issues.id"), nullable=True)
+    
+    project = relationship("Project", back_populates="issues")
+    reporter = relationship("User", foreign_keys=[reporter_id], back_populates="reported_issues")
+    assignee = relationship("User", foreign_keys=[assignee_id], back_populates="assigned_issues")
+    comments = relationship("Comment", back_populates="issue", cascade="all, delete-orphan")
+
+
+class Comment(Base):
+    __tablename__ = "comments"
+
+    id = Column(Integer, primary_key=True, index=True)
+    content = Column(Text, nullable=False)
+    issue_id = Column(Integer, ForeignKey("issues.id"), nullable=False)
+    author_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    issue = relationship("Issue", back_populates="comments")
+    author = relationship("User", back_populates="comments")
+
+
+class Project(Base):
+    __tablename__ = "projects"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(100), unique=True, nullable=False)
+    description = Column(Text, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    
+    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    
+    issues = relationship("Issue", back_populates="project", cascade="all, delete-orphan")
+    members = relationship("ProjectMember", back_populates="project", cascade="all, delete-orphan")
+    owner = relationship("User", back_populates="owned_projects")
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String(50), unique=True, nullable=False)
+    email = Column(String(100), unique=True, nullable=False)
+    hashed_password = Column(String(255), nullable=True)  # Nullable for OAuth users
+    full_name = Column(String(100), nullable=True)
+    is_active = Column(Boolean, default=True)
+    is_admin = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    
+    owned_projects = relationship("Project", back_populates="owner")
+    reported_issues = relationship("Issue", foreign_keys=[Issue.reporter_id], back_populates="reporter")
+    assigned_issues = relationship("Issue", foreign_keys=[Issue.assignee_id], back_populates="assignee")
+    comments = relationship("Comment", back_populates="author")
+    project_memberships = relationship("ProjectMember", back_populates="user")
+
+
+class ProjectMember(Base):
+    __tablename__ = "project_members"
+
+    id = Column(Integer, primary_key=True, index=True)
+    project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    role = Column(String(20), default="dev")  # admin, dev, mgr, ops
+    
+    project = relationship("Project", back_populates="members")
+    user = relationship("User", back_populates="project_memberships")