Fix/sendgrid retry and body size limit#1027
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- Add sendgrid_retries_total{reason} counter to Metrics
- Retry on 429 and 5xx responses (max 3 attempts)
- Exponential backoff with jitter (2^attempt * 100ms + rand[0,100)ms)
- Respect Retry-After header on 429 responses
- Add wiremock to dev-dependencies for HTTP mock testing
- Add test: two 429s followed by 202 verifies email sent and counter=2
Closes #reliability #email
…ed body) - Add DEFAULT_REQUEST_BODY_MAX_BYTES = 1 MiB constant - Add request_size_validation_middleware to validation.rs - Fast path: reject on Content-Length header > limit - Slow path: buffer chunked body via axum::body::to_bytes with cap - Returns 413 Payload Too Large with JSON error body - Add content_type_validation_middleware (415 for non-JSON POST/PUT/PATCH) - Add request_validation_middleware (400 for SQLi/path-traversal patterns) - Add parse_request_body_max_bytes() for env-var override - Add two_mb_body_returns_413 integration test Closes #security #reliability #api
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closes #922
closes #923
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