Intake/counterparty: pass user organisation to LLM + self-reference guard

The intake and counterparty extraction prompts didn't tell the model
which side of the agreement was "us", so the LLM sometimes returned the
user's own org as the counterparty (Kodex, Inc. on Adobe contracts -
biased by Kodex appearing in the filename).

- userSettings now reads + returns user_profiles.organisation.
- buildSystemPrompt() in intakeAnalysis + counterpartyExtraction injects
  "the user's own organization is X - never return X as the counterparty"
  into the system prompt.
- isSelfReference() guard normalises company suffixes (Inc, LLC, ...) and
  nulls counterparty/parent if the model returns a self-match anyway.
- Orchestrators thread organisation through the analysis call.

Set your org in /account/profile (organisation field) for this to work.