Simplify reference workflows and documentation

[srikanth-bitdynamics]

Summary

• Add a newcomer-first path from DEX, AMM, and Token Standard V2 concepts to the active Daml workflows.
• Simplify order funding, matched-trade recording, liquidity evidence handling, and their tests.
• Clearly retire package-lineage-only choices while keeping upgrade compatibility.
• Remove unused credential, registry-client, wallet, example, and duplicate test surfaces.
• Align the UI, operator API, and public documentation with the implemented workflows.
• Expand CI coverage across Daml, backend, frontend, documentation, and smoke checks.

Architecture boundary

The public settlement surface remains explicit and Token Standard V2-based. This change does not introduce a generic pool executor, route bilateral order or RFQ settlement through the AMM, or add a project-specific cross-component Daml interface.

Verification

• bash scripts/run-local-daml-tests.sh: 98 scripts passed.
• bash scripts/check-upgrade-compat.sh: passed.
• Backend typecheck: passed.
• Backend tests: 234 passed, 1 opt-in Canton test skipped.
• Frontend tests: 84 passed.
• Frontend production build: passed.
• Documentation build: 26 pages passed.
• bash scripts/e2e-smoke.sh: passed.