Remove unused imports from investigations.py

[Copilot]

Addresses code review feedback from PR #35 identifying unused imports in the investigations API route.

Changes

• Removed AgentFinding and InvestigationType imports from examples/google-cloud-financial-advisor/backend/src/api/routes/investigations.py
• These types are defined in the models but not referenced in the route handlers

# Before
from ...models.investigation import (
    AgentFinding,        # Unused
    AuditTrailEntry,
    Investigation,
    InvestigationCreate,
    InvestigationStatus,
    InvestigationType,   # Unused
)

# After
from ...models.investigation import (
    AuditTrailEntry,
    Investigation,
    InvestigationCreate,
    InvestigationStatus,
)

All remaining imports are actively used in the route handlers.

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Project	Deployment	Actions	Updated (UTC)
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