Add SDK PII redaction docs to zeroeval-docs

[sebastiancrossa]

Adds SDK-side PII redaction documentation pages for Python and TypeScript tracing SDKs.

• New page tracing/pii-redaction.mdx with feature overview, enablement, scope, placeholder behavior, normalization, and examples
• Added tracing/pii-redaction to docs.json navigation after introduction
• Added Note to tracing/introduction.mdx linking to PII redaction
• Added Tip to tracing/sdks/python/setup.mdx with redaction={"enabled": True} and ZEROEVAL_REDACT_PII=true syntax
• Added Tip to tracing/sdks/typescript/setup.mdx with redaction: { enabled: true } and ZEROEVAL_REDACT_PII=true syntax
• Added redaction init parameter to tracing/sdks/python/reference.mdx with snake_case keys table (enabled, redact_inputs, redact_outputs, redact_attributes, redact_errors, redact_session_names, redact_tag_values, sensitive_keys, custom_patterns)
• Added redaction init option to tracing/sdks/typescript/reference.mdx with camelCase keys table (enabled, redactInputs, redactOutputs, redactAttributes, redactErrors, redactSessionNames, redactTagValues, sensitiveKeys, customPatterns)
• Added ZEROEVAL_REDACT_PII env var to both reference pages

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Note

Low Risk
Documentation-only changes that add a new tracing guide and update Python/TypeScript SDK docs; low risk aside from potential confusion if the documented defaults/options diverge from SDK behavior.

Overview
Adds a new Tracing guide page, tracing/pii-redaction, describing opt-in SDK-side PII redaction (what is redacted, placeholder behavior, normalization, limitations, and runnable examples for Python/TypeScript).

Updates navigation and entry points by linking the new page from tracing/introduction and adding setup tips in both SDK setup guides, plus extends Python/TypeScript SDK reference docs with a redaction init option (including key tables) and the ZEROEVAL_REDACT_PII env var; also tweaks Python init docs to show setup_otlp defaulting to False.

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