Docs: self-host troubleshooting for missing tables / RLS / edge 404s

[telivity-otaip]

Why

Most “CareerOps is broken” reports from self-hosters are config: schema not applied, RLS denying the anon key, or edge functions not deployed. Today that knowledge is scattered across web/README.md, web/SCHEMA.md, and supabase/README.md.

Size

S — one focused troubleshooting doc.

Task

Add docs/TROUBLESHOOTING.md (or a section under web/README.md) covering:

1. Blank / Configure wall — config.js missing or still placeholder URL/key
2. PostgREST / missing relation — forgot supabase/schema.sql or migrations
3. Rows won’t save — RLS / wrong project / signed-out
4. Search / match / rewrite fail — which edge functions are optional vs needed (web/README Edge functions table)
5. Google OAuth “not enabled” — expected until provider is configured

Link web/SCHEMA.md, supabase/README.md, and the demo at careerops.telivity.app as a reference — not as a place to steal credentials.

Acceptance

• Concrete symptoms → checks → fixes
• Explicit: never commit web/config.js; never reuse Telivity demo keys
• Linked from root README or docs/README.md
• No secrets, no internal vault paths

Out of scope

Changing runtime error UX (nice follow-up issue if you want it).