Generate API docs

[amahuli03]

Description

• Adds drf-spectacular for automatic OpenAPI 3.0 schema generation and interactive API docs
• Serves Swagger UI at /api/docs/ and ReDoc at /api/redoc/ for browsing and testing endpoints
• Adds @extend_schema annotations and serializer_class attributes across all API views so request bodies, response schemas, and parameters are fully documented
• Configures JWT authentication in Swagger UI so developers can authorize and test protected endpoints directly

Changes

Configuration

• Added drf-spectacular to requirements.txt
• Added drf_spectacular to INSTALLED_APPS and set DEFAULT_SCHEMA_CLASS in settings.py
• Added SPECTACULAR_SETTINGS with project metadata, JWT security scheme, and Swagger UI config

URL Routes

• /api/schema/ — raw OpenAPI JSON/YAML schema
• /api/docs/ — Swagger UI
• /api/redoc/ — ReDoc UI

Schema Annotations

Added @extend_schema with inline_serializer for views that return raw dicts:

• listMeds — GetMedication, DeleteMedication
• risk — RiskWithSourcesView
• uploadFile — file upload (multipart), delete, PDF retrieval
• conversations — continue_conversation, update_title
• embeddings — AskEmbeddingsAPIView (with query params)
• text_extraction — RuleExtractionAPIView, RuleExtractionAPIOpenAIView
• assistant — Assistant
• version — VersionView
• medRules — MedRules POST

Added serializer_class for auto-detection on:

• ListOrDetailMedication, AddMedication, UploadFileView, MedRules, FeedbackView

Added @extend_schema referencing existing serializers on function-based views:

• ai_promptStorage — store_prompt, get_all_prompts
• ai_settings — settings_view

Fixed @extend_schema_field on MedRuleSerializer.get_medication_sources to resolve type hint warning.

How to Use

SwaggerUI is found at localhost:800/api/docs
To test endpoints that require auth, follow this flow:

1. Send a POST request to /auth/jwt/create/ with email and password in the request body (Can do this in Swagger UI itself with the "try it out" feature)
2. Copy the access token from the response
3. At the top right of the docs page, click the authorize button and enter the access token in this format:
   JWT <access_token>
4. Subsequent requests from here (For the next 60 minutes) will include your token.

Related Issue

Closes #470

Manual Tests

• Rebuilt backend container
• Visited /api/docs/ to confirm Swagger UI loads with all endpoints listed
• Visited '/api/redoc/` to confirm ReDoc also loads with all endpoints listed
• Added auth and tested that works as well (got token, authorized it, and tested a protected endpoint all within the docs)
• Added schema annotations and verified all endpoints have correct query params, request body, and/or response schema

Documentation

I can add a line or two about accessing and using the API docs in the local development section of the README if that would be useful.

Reviewers

@sahilds1