Add specifications for gamification, generation, and R42 chat services

- Introduced gamification service spec detailing responsibilities, API surface, XP calculation, levels, streaks, badges, milestone cards, and heatmap data.
- Added generation service spec outlining the process for generating micro learning content, including API endpoints, AI call configuration, prompt strategies, and error handling.
- Created R42 chat service spec covering chatbot interactions, retrieval pipeline, prompt construction, response generation, and stateless design principles.

app/services/ingestion/test-files/sample.pdf

@@ -0,0 +1,55 @@
+%PDF-1.4
+1 0 obj
+<</Type /Catalog /Pages 2 0 R>>
+endobj
+2 0 obj
+<</Type /Pages /Kids [3 0 R] /Count 1>>
+endobj
+3 0 obj
+<</Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Resources <</Font <</F1 4 0 R>>>> /Contents 5 0 R>>
+endobj
+4 0 obj
+<</Type /Font /Subtype /Type1 /BaseFont /Helvetica>>
+endobj
+5 0 obj
+<</Length 582>>
+stream
+BT
+/F1 14 Tf
+50 750 Td
+(Introduction to Docker Containers) Tj
+0 -25 Td
+/F1 12 Tf
+(Docker is a platform for developing shipping and running applications.) Tj
+0 -18 Td
+(Containers are lightweight portable units that include all dependencies.) Tj
+0 -25 Td
+/F1 14 Tf
+(Container Images) Tj
+0 -25 Td
+/F1 12 Tf
+(A Docker image is a read-only template used to create containers.) Tj
+0 -18 Td
+(Images are built from a Dockerfile with build instructions.) Tj
+0 -25 Td
+/F1 14 Tf
+(Docker Compose) Tj
+0 -25 Td
+/F1 12 Tf
+(Docker Compose defines multi-container applications in compose.yml.) Tj
+ET
+endstream
+endobj
+xref
+0 6
+0000000000 65535 f
+0000000009 00000 n
+0000000056 00000 n
+0000000111 00000 n
+0000000231 00000 n
+0000000299 00000 n
+trailer
+<</Size 6 /Root 1 0 R>>
+startxref
+930
+%%EOF