PAM-4 PAM Web launcher: Implement Postgres access via browser

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Greptile Summary

Adds documentation for the PAM PostgreSQL Web Access feature, which allows users to run SQL queries against PostgreSQL databases directly from the browser via the Infisical dashboard.

• New overview page (overview.mdx) explaining how Web Access works, including a mermaid sequence diagram of the WebSocket-based architecture, session limits table, and links to supported resources.
• New PostgreSQL page (postgresql.mdx) with step-by-step connection instructions, SQL usage examples, transaction support, PostgreSQL-specific limits (30s statement timeout), and an FAQ clarifying it's a custom SQL REPL rather than an actual psql session.
• Navigation updated in docs.json to add a "Web Access" sub-group under PAM Product Reference.
• Four supporting screenshots added for the connection flow UI.

Confidence Score: 5/5

• This is a docs-only PR with no code changes — safe to merge.
• This PR adds only documentation files (MDX) and images (PNG). There are no code changes, no API modifications, and no security implications. The documentation is well-structured, consistent with existing PAM docs, has correct internal cross-references, and all referenced images are present.
• No files require special attention.

Important Files Changed

_{Last reviewed commit: 49fbf77}