feat: 5021 5019 Add Mint Token search and Project Practices search to Indexer

[kodareef5]

Summary

Implements two new Indexer search capabilities as specified in #5021 and #5019.

Mint Token Search (#5021)

Users can search, filter, and browse issued carbon credit tokens (Mint Token VP documents) to find suitable carbon credits:

• Token ID — filter by specific token
• Policy/Methodology — filter by governing policy, with human-readable policy name in results
• Amount range — filter by min/max minted amount
• Date range — filter by issuance period
• Keywords — free-text search across document fields
• Geography — visible in results grid
• Results enriched with token metadata (name, symbol, type, supply) from TokenCache and policy metadata (name, description)

Project Practices Search (#5019)

Users can compare how different projects implement the same methodology:

• Policy ID — find all documents under a specific methodology
• Schema name — filter by document type (case-insensitive substring match)
• Schema ID — filter by exact schema identifier
• Topic — filter by topic ID
• Keywords — search within document field values
• Results enriched with policy name for readability

Changes (14 files, +1,127/-3)

Backend — Message API (indexer-common)

• 6 new message patterns for both search capabilities

Backend — Service Layer (indexer-service)

• getMintTokenDocuments() — paginated VP search with token + policy enrichment, amount/date range filters
• getMintTokenDocument() — detail view with full document, token info, policy info
• getMintTokenFilters() — available policies and tokens for filter dropdowns
• getProjectPractices() — paginated VC search with policy enrichment, schema name regex filter
• getProjectPracticesFilters() — available schema names and policies for filters
• Response includes explicit top-level policyId, policyDescription, geography fields

Backend — API Gateway (indexer-api-gateway)

• 6 REST endpoints with full Swagger documentation

Frontend (indexer-frontend)

• MintTokensComponent — grid with columns: amount, token name/symbol/ID, policy, geography, status, date
• ProjectPracticesComponent — grid with policy enrichment and schema filtering
• Both components load filter options from API via loadFilters()
• Routes: /mint-tokens, /mint-tokens/:id, /project-practices, /project-practices/:id
• Navigation: both added to Methodologies menu
• i18n: English translations for all new labels

Architecture

Follows the exact patterns of existing entity endpoints:

• Gateway routes to service via NestJS microservices message patterns
• Service queries MongoDB via mikro-orm with parsePageParams/parsePageFilters
• Frontend uses Angular standalone components extending BaseGridComponent
• Token metadata enriched by batch query to TokenCache collection
• Policy metadata enriched by batch query to INSTANCE_POLICY messages
• Keywords use escapeStringRegexp via existing parseKeywordFilter
• Schema name uses createRegex for case-insensitive substring matching

Security

• Token ID, Policy ID, Schema ID use exact match (no regex injection)
• Schema name goes through createRegex which calls escapeStringRegexp
• Keywords handled by existing parseKeywordFilter with escapeStringRegexp
• Amount values converted via Number() before MongoDB query
• No user input passed directly to MongoDB operators

Closes #5021
Closes #5019

Test Plan

• GET /entities/mint-tokens returns paginated VP documents with token enrichment
• Filter by tokenId, policyId, amount range, date range, keywords all work
• Response includes policyId, policyDescription, geography at top level
• GET /entities/mint-tokens/filters returns available policies and tokens
• GET /entities/mint-tokens/:messageId returns detail with token + policy info
• GET /entities/project-practices returns paginated VC documents with policy enrichment
• Filter by policyId, schemaName (substring), schemaId (exact), topicId, keywords
• GET /entities/project-practices/filters returns schema names and policies
• Frontend grids load, sort, paginate, and filter correctly
• Navigation shows both items under Methodologies menu
• Detail views navigate correctly via "Open" button

[kodareef5]

Hi @prernaadev01 @ruslanPL-EnvisionBlockchain — I'm unable to assign myself due to permissions. Could you please update the assignee? Happy to address any review feedback. Thanks!