test(auth): comprehensive wallet verification test coverage

[Democodes-flash]

Changes

Updated test files

• session.test.ts: Fix mock return values (undefined for missing cookies), add cookie attribute assertions (name, value, httpOnly, sameSite, path, expires, secure)
• stellar.test.ts: Add real Ed25519 keypair signature test, wrong-key negative test, version byte/checksum edge cases
• jwt.test.ts: Add parseJson catch tests (invalid JSON, binary garbage, empty strings)

New test files

• store.test.ts: Test all store functions via mocked sql
• middleware.test.ts: Test withAuth via mocked session
• rbac.test.ts: Test withRbac, withAnyRbac, withAllRbac, withRole, and helper functions
• admin.test.ts: Test withAdmin
• constants.test.ts: Test hasPermission, hasAnyPermission, hasAllPermissions

Coverage

• Auth modules: 99.62% stmts, 99.15% branch, 100% funcs, 99.61% lines
• Session.ts: 100% lines, 96.42% branch
• Stellar.ts: 98.33% lines (line 63 dead code catch unreachable)
• All 162 tests passing across 9 test files

Closes #158

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