Polish API collection content for docs generation

[roncodes]

Summary

Polishes the Native Git Postman collections that feed the generated API reference docs.

This PR:

• fixes stale and copy-pasted endpoint descriptions
• normalizes embedded URL query strings into queryParams maps
• adds .params.yaml and .queryParams.yaml sidecars for docs parameter tables
• keeps Storefront and Ledger namespace handling explicit through collection-level api_prefix

Fix #1: stale descriptions touched

Fleetbase API:

• Contacts: Query Contacts
• Fleets: Query Fleets
• Orders: Capture QR Code for Order, Capture Signature for Order, Dispatch an Order, Get Order Next Activity, Set Order Destination, Start an Order, Update Order Activity
• Places: List all Places, Query Places
• Service Areas: Query Service Areas
• Tracking Statuses: Update a Tracking Status
• Zones: Create a Zone, Query Zones, Retrieve a zone

Storefront API:

• Cart: Add Item to Cart, Empty cart, Remove item from cart, Retrieve a Cart, Retrieve or Create Cart
• Category: List categories
• Checkout: Capture checkout as order
• Customer: Authenticate a Customer, Authenticate a Customer via SMS, Create a Customer, List a customer orders, List a customer saved places, Query customers, Register customer device, Setups a verification request to create a new storefront customer, Update a Customer, Verify a SMS code
• Delivery Service Quote: Retrieve a Delivery Service Quote
• Products: Query Products, Retrieve a Product
• Store Locations: Query Store Locations

Fix #2: query parameter normalization

Moved embedded query strings out of request url fields and into Native Git queryParams maps across 41 request files. A final grep confirmed no url: ...? remains in postman/collections/**/*.request.yaml.

Fix #3: parameter metadata coverage

Added 94 sidecar metadata files:

• Fleetbase API: create/update request body params and non-trivial query params
• Fleetbase Core API: create/update request body params and non-trivial query params
• Fleetbase Ledger API: wallet query params
• Fleetbase Storefront API: create/update request body params and non-trivial query params
• Fleetbase Integrated Vendor Flow: workflow form params and query params

Verification

• pnpm postman:lint
• node scripts/validate-collections.js
• YAML parse for postman/collections/**/*.yaml
• POSTMAN_COLLECTIONS_DIR=/Users/ron/Development/fleetbase/postman/postman/collections node scripts/generate-api-docs.mjs completed successfully from fleetbase.io
• Spot-checked content/docs/api/fleetbase/places.mdx
• Spot-checked content/docs/api/storefront/cart.mdx

Note: Postman CLI is not installed locally, so scripts/lint-collections.sh ran the repository validator and skipped Postman CLI schema lint as designed.