feat(skills): enhance skills system with matching and evaluation

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/app/schemas/skill.py

@@ -14,6 +14,10 @@ class SkillCreate(BaseModel):
     visibility: str = "private"
     team_id: Optional[str] = None
     is_active: bool = True
+    status: str = "active"
+    scope: list[str] = []
+    effectiveness: Optional[float] = None
+    review_after: Optional[datetime] = None
 
 
 class SkillUpdate(BaseModel):
@@ -28,6 +32,10 @@ class SkillUpdate(BaseModel):
     visibility: Optional[str] = None
     team_id: Optional[str] = None
     is_active: Optional[bool] = None
+    status: Optional[str] = None
+    scope: Optional[list[str]] = None
+    effectiveness: Optional[float] = None
+    review_after: Optional[datetime] = None
 
 
 class SkillOut(BaseModel):
@@ -43,6 +51,12 @@ class SkillOut(BaseModel):
     is_builtin: bool
     team_id: Optional[str]
     is_active: bool
+    status: str
+    scope: list[str]
+    effectiveness: Optional[float]
+    review_after: Optional[datetime]
+    activation_count: int
+    last_activated_at: Optional[datetime]
     owner_id: str
     created_at: datetime
     updated_at: datetime