PM-5499 extend shocase post

[vas3a]

This pull request introduces enhanced integration with external Topcoder APIs to enrich project showcase posts with additional challenge metadata, such as the number of submissions, registrants, skills, track, and participating countries. It also improves filtering capabilities for industries and categories and updates the API response structure accordingly. The most important changes are as follows:

Integration with External APIs and Metadata Enrichment:

• Added new dependencies for Topcoder challenge, member, resource, and skills DBs in package.json to enable fetching external challenge data.
• Implemented the ChallengeMetadataDto and logic in ProjectShowcasePostService to aggregate challenge metadata (submissions, registrants, skills, track, countries) for each showcase post by querying the specific databases.

Configuration Updates:

• Added new environment variables in .env.example for external database URLs required.

[Copilot]

Pull request overview

This PR enriches project showcase post responses by aggregating Topcoder challenge metadata from external databases and expands filtering documentation for industries/categories.

Changes:

• Added external Prisma client helpers for Topcoder challenge/member/resource/skills databases.
• Updated ProjectShowcasePostService to load and attach per-challenge metadata (submissions, registrants, skills, track, countries) to showcase post DTOs.
• Updated API DTOs/Swagger decorators and tests to reflect the enriched response and array-based filtering docs.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/shared/global/external-prisma.client.ts	Adds lazy singleton external Prisma clients and env-driven DB URL wiring.
src/api/project-showcase-post/project-showcase-post.service.ts	Loads external challenge metadata and adds projectTitle/challengeMetadata to responses.
src/api/project-showcase-post/project-showcase-post.service.spec.ts	Mocks external Prisma clients and asserts metadata-related queries are made.
src/api/project-showcase-post/project-showcase-post.controller.ts	Updates Swagger query documentation to indicate array inputs for industry/category filters.
src/api/project-showcase-post/dto/project-showcase-post-response.dto.ts	Extends response schema with projectTitle and challengeMetadata.
src/api/project-showcase-post/dto/project-showcase-post-list-query.dto.ts	Updates Swagger metadata for industry/category filters to show array typing.
src/api/project-showcase-post/dto/challenge-metadata.dto.ts	Introduces DTO for aggregated challenge metadata payload.
package.json	Adds Topcoder API repos as dependencies to access their Prisma clients.
.env.example	Adds required external DB URL environment variables.

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