feat: parallelize hatchet (#804)

* parallelize hatchet (no-mistakes)

* dry (no-mistakes) (minimal)

* comments

* self-review

* self-review

* self-review

* self-review

* pr comments

* pr comments

---------

Co-authored-by: Igor Loskutov <igor.loskutoff@gmail.com>

server/reflector/hatchet/constants.py

@@ -0,0 +1,16 @@
+"""
+Hatchet workflow constants.
+"""
+
+# Rate limit key for LLM API calls (shared across all LLM-calling tasks)
+LLM_RATE_LIMIT_KEY = "llm"
+
+# Max LLM calls per second across all tasks
+LLM_RATE_LIMIT_PER_SECOND = 10
+
+# Task execution timeouts (seconds)
+TIMEOUT_SHORT = 60  # Quick operations: API calls, DB updates
+TIMEOUT_MEDIUM = 120  # Single LLM calls, waveform generation
+TIMEOUT_LONG = 180  # Action items (larger context LLM)
+TIMEOUT_AUDIO = 300  # Audio processing: padding, mixdown
+TIMEOUT_HEAVY = 600  # Transcription, fan-out LLM tasks