Add integration test suites for fees, analytics, identity, and database

[kike-alt]

Summary

Adds four integration test suites covering the fees, analytics, identity, and database contracts (17 new tests, all running in CI).

Fees (#922)

• Per-operation fee configs override default pricing; the fixed strategy returns the configured base verbatim.
• Config bound validation (min > max, base < min rejected) and admin gating on set_operation_config.
• Treasury accumulation across recorded collections, 50/50 validator distribution split with configurable shares, idempotent validator registration, reward claiming without double-pay, and empty-distribution no-op.
• Congestion-driven update_fee_params eases the base fee down 5% at low load while respecting the floor; admin-only enforcement.

Analytics (#923)

• Market metric updates and read-back, batch updates applying last-write-wins, and batch size limits rejecting wholesale without state corruption.
• Historical trend ordering preserved and the latest trend embedded verbatim in generated market reports.
• Sentiment volumes accumulate across updates; ratios flow into reports (600/400 → 6000 bips).
• Portfolio positions round-trip per owner; benchmark indices track per property type.
• Two-step admin key rotation: requester must be admin, cooldown blocks premature confirmation, only the nominee can confirm, pending request blocks re-request.

Identity (#924)

• DID format validation (did:method:id) and duplicate identity rejection.
• Verifier-gated verification raising trust score by level with expiry stamping.
• Reputation updates restricted to authorized callers, moving scores up on success / down on failure against threshold checks.
• Recovery initiation requires a well-sized signature, flips active state (re-initiation blocked), and guardian approvals reject unauthorized callers. Note: recovery cannot be completed today because there is no public message to add guardians — documented in the suite header.

Database (#925)

• Full sync lifecycle: emit → indexer confirm → checksum verify (accept/reject), per-data-type last-synced-block cursor.
• Publisher authorization gates sync emission (authorize → allowed → revoke → blocked).
• Admin-gated analytics snapshots retrievable by id with field-level verification.
• Export requests validate ranges (from > to rejected), complete with integrity checksums, unknown ids fail cleanly.
• Indexer management: admin-only registration, duplicate rejection, deactivation flipping status.

Infrastructure notes

• The three contract modules (propchain_fees, propchain_analytics, propchain_database) are now declared pub so external test binaries can link them — identity and oracle already were.
• tests/Cargo.toml gains the four dependencies and explicit [[test]] targets: the package root is the tests directory itself, so cargo's auto-discovery never picks up files placed there (pre-existing suites have the same blind spot; left untouched to keep this PR scoped).
• Crate-level #![allow(clippy::clone_on_copy)] added workspace-wide: current nightly fires it inside ink!-generated storage accessors on a pristine checkout of main, failing -D warnings for every PR.

Test plan

• cargo +nightly fmt --check
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-features --workspace (629 passed, 0 failed)

[drips-wave]

Hey @kike-alt! 👋 It looks like this PR isn't linked to any issue.

If this PR is for one of the issues assigned to you as part of a Wave, please link it to ensure your contribution is tracked properly. You can do this by adding a keyword to the PR description (e.g., Closes #123), or by clicking a button below:

Issue	Title
#925	Database contract has no workspace integration coverage: tests/ never exercises propchain-database	Link to this issue
#922	Fees has no workspace integration coverage: tests/ never exercises propchain-fees	Link to this issue
#924	Identity has no workspace integration coverage: tests/ never exercises propchain-identity	Link to this issue
#923	Analytics has no workspace integration coverage: tests/ never exercises propchain-analytics	Link to this issue

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