docs: fix Context7 suggestions - #827

All 10 suggestions are now resolved. Here is the final report:

• Global DB limits and EVAL routing — primary region immutability and EVAL_RO read-region routing now stated, in redis/features/globaldatabase.mdx
• Local Docker dev with SRH credentials — added local UPSTASH_REDIS_REST_URL/TOKEN setup, in redis/sdks/ts/developing.mdx
• REST curl examples and Vercel KV vars — added INCR example and KV_REST_API_* note, in redis/features/restapi.mdx
• Landing page and consolidated llms-full.txt — skipped: landing page and aggregated llms files already exist
• Search feature SDK examples and parameters — skipped: both pages already carry TS/Python examples and step-by-step guides
• PAYG budget minimum, unit, and rate-limit — skipped: rate-limit and cents unit documented; minimum unsupported by source
• Stats endpoint HTTP auth and response schema — skipped: openapi already renders endpoint, basicAuth, and schemas
• Management API list/get/stats endpoints — skipped: all three endpoints already rendered in API Reference
• Single logical database and SELECT restriction — skipped: select, restapi compat table, and billing already cover it
• PEXPIRETIME reference page — skipped: dedicated page already exists with syntax, semantics, and replies