Upgrade cache prefix for runpod v2

[tomkosm]

Merge after runpod v2 is live

[entelligence-ai-reviews]

Walkthrough

This update implements a new versioning scheme for the PDF cache in the GCS integration by updating the cache key prefix and associated metadata. The changes ensure that cached PDF results are clearly separated by version, reducing the risk of conflicts or confusion with previous cache entries. No new logic or functions are introduced; the modifications are limited to string constants for cache key and metadata versioning.

Changes

File(s)	Summary
apps/api/src/lib/gcs-pdf-cache.ts	Updated PDF cache key prefix from 'pdf-cache/' to 'pdf-cache_v2/' and changed the 'source' metadata field from 'runpod_pdf_conversion' to 'runpod_pdf_conversion_v2' to support new cache versioning.

Sequence Diagram

This diagram shows the interactions between components:

sequenceDiagram
    title PDF Processing and Caching System

    participant Client
    participant PDFProcessor
    participant CacheService
    participant GCSStorage as "Google Cloud Storage"
    
    Client->>PDFProcessor: Request PDF processing
    
    Note over PDFProcessor: Using updated cache prefix<br/>"pdf-cache_v2/"
    
    PDFProcessor->>CacheService: Check if PDF is cached (SHA-256 hash)
    CacheService->>GCSStorage: Look for cached result
    
    alt Cache exists
        GCSStorage-->>CacheService: Return cached result
        CacheService-->>PDFProcessor: Return cached result
        PDFProcessor-->>Client: Return processed PDF data
    else Cache miss
        GCSStorage-->>CacheService: No cache found
        CacheService-->>PDFProcessor: Cache miss
        
        PDFProcessor->>PDFProcessor: Process PDF content
        
        PDFProcessor->>CacheService: Store result in cache
        
        Note over CacheService: Using updated metadata<br/>source: "runpod_pdf_conversion_v2"
        
        CacheService->>GCSStorage: Save JSON result with metadata
        GCSStorage-->>CacheService: Confirm storage
        CacheService-->>PDFProcessor: Confirm caching
        PDFProcessor-->>Client: Return processed PDF data
    end

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