feat: add public monitor API + admin provider/server management scaffold

app/models/monitor.py

@@ -0,0 +1,58 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, Float, ForeignKey
+from sqlalchemy.sql import func
+from app.core.config import Base
+
+
+class ProviderAccount(Base):
+    __tablename__ = 'provider_accounts'
+
+    id = Column(Integer, primary_key=True, index=True)
+    provider = Column(String(32), nullable=False, index=True)  # anthropic/openai/minimax/kimi/qwen
+    label = Column(String(128), nullable=False)
+    credential = Column(Text, nullable=False)  # TODO: encrypt at rest
+    is_enabled = Column(Boolean, default=True)
+    created_by = Column(Integer, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class ProviderUsageSnapshot(Base):
+    __tablename__ = 'provider_usage_snapshots'
+
+    id = Column(Integer, primary_key=True, index=True)
+    account_id = Column(Integer, ForeignKey('provider_accounts.id'), nullable=False, index=True)
+    window_label = Column(String(32), nullable=True)  # e.g. 1h / 7d
+    used = Column(Float, nullable=True)
+    limit = Column(Float, nullable=True)
+    usage_pct = Column(Float, nullable=True)
+    reset_at = Column(DateTime(timezone=True), nullable=True)
+    status = Column(String(32), nullable=False, default='unknown')  # ok/error/pending/unsupported
+    error = Column(Text, nullable=True)
+    raw_payload = Column(Text, nullable=True)
+    fetched_at = Column(DateTime(timezone=True), server_default=func.now(), index=True)
+
+
+class MonitoredServer(Base):
+    __tablename__ = 'monitored_servers'
+
+    id = Column(Integer, primary_key=True, index=True)
+    identifier = Column(String(128), nullable=False, unique=True)
+    display_name = Column(String(128), nullable=True)
+    is_enabled = Column(Boolean, default=True)
+    created_by = Column(Integer, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class ServerState(Base):
+    __tablename__ = 'server_states'
+
+    id = Column(Integer, primary_key=True, index=True)
+    server_id = Column(Integer, ForeignKey('monitored_servers.id'), nullable=False, unique=True)
+    openclaw_version = Column(String(64), nullable=True)
+    agents_json = Column(Text, nullable=True)  # json list
+    cpu_pct = Column(Float, nullable=True)
+    mem_pct = Column(Float, nullable=True)
+    disk_pct = Column(Float, nullable=True)
+    swap_pct = Column(Float, nullable=True)
+    last_seen_at = Column(DateTime(timezone=True), nullable=True)
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())