Migrate config to Pydantic, fix datetime deprecation, add import guards

[Copilot]

Addressed code review feedback requiring config validation, timezone-aware timestamps, and graceful degradation for optional dependencies.

Config Models → Pydantic

Migrated dataclass configs to Pydantic BaseModel with validation:

# Before: No validation, secrets exposed in logs
@dataclass
class LLMConfig:
    api_key: str | None = None
    temperature: float = 0.7
    max_tokens: int = 4096

# After: Validated, secrets redacted
class LLMConfig(BaseModel):
    api_key: SecretStr | None = None
    temperature: float = Field(default=0.7, ge=0.0, le=2.0)
    max_tokens: int = Field(default=4096, gt=0)

• DatabaseConfig/RedisConfig: URL format validation (requires ://)
• LLMConfig: temperature ∈ [0.0, 2.0], max_tokens > 0
• WorkflowConfig: max_concurrent > 0, retry_attempts ≥ 0
• GitHubConfig: SecretStr for token, private_key, webhook_secret

Datetime Deprecation

Replaced datetime.utcnow() with datetime.now(timezone.utc):

# base.py, events.py
created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))

All timestamps now timezone-aware (UTC).

Import Guards

Made optional dependency imports failsafe:

# Category modules degrade gracefully
ai_actions = None
try:
    from codeflow_engine.actions import ai_actions
except (ImportError, OSError):
    pass

• Added FindStaleIssuesOrPRs to guarded exports
• Wrapped autogen, llm submodule imports
• Guarded EnterpriseAuthorizationManager import
• All category modules (ai_actions, platform, quality, etc.) now optional

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