feat: convention-based serving from contract/generated/

[fyzanshaik-atlan]

Summary

• SDK auto-serves configmap and manifest from contract/generated/ directory
• Apps with PKL contracts no longer need get_configmap() or get_manifest() overrides
• Fully backward compatible — falls back to existing behavior when directory doesn't exist

Changes

• handlers/__init__.py: get_configmap() scans contract/generated/ for {config_map_id}.json
• application/__init__.py: get_manifest() reads contract/generated/manifest.json
• metadata_extraction/sql.py: get_manifest() calls super() first so contract takes priority over hardcoded Python DAG
• server/fastapi/__init__.py: new GET /configmaps list endpoint for contract discovery

Fallback chain

configmap: contract/generated/{id}.json → handler override → {}
manifest:  contract/generated/manifest.json → Python get_manifest() → None

Depends on

• Built on top of fix: add native routing #1088 (native AE routes) — base branch is native_routes
• Companion to app-contract-toolkit

Test plan

• App without contract/generated/ behaves identically to before
• App with contract/generated/ serves configmap and manifest from files
• SQL app's hardcoded manifest is overridden when contract file exists
• GET /configmaps returns list of available configmap IDs

[greptile-apps]

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[snykgituser]

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