refactor(db): move ensureXxxTables() guards from methods to constructors

[aaight]

Summary

• Moves all ensureXxxTables() guard calls from every public method body to the repository constructors, eliminating 126+ redundant per-method calls
• Updates IndexDatabase.initialize() to drop all tables (including ones eagerly created by constructors) so the reset sequence remains correct
• All 2256 tests pass with zero regressions

What was implemented

• ModuleRepository: ensureModulesTables() moved to constructor; 31 per-method calls removed
• InteractionRepository: ensureInteractionsTables(), ensureModulesTables(), ensureInteractionDefinitionLinks() moved to constructor; 22+ per-method calls removed
• FlowRepository: ensureFlowsTables(), ensureInteractionsTables(), ensureModulesTables() moved to constructor; 33+ per-method calls removed
• InteractionAnalysis: ensureInteractionsTables(), ensureModulesTables() moved to constructor; 15 per-method calls removed
• CallGraphService: ensureModulesTables() moved to constructor; 3 per-method calls removed
• FeatureRepository: ensureFeaturesTables(), ensureFlowsTables() moved to constructor; 2 per-method calls removed
• DomainRepository: ensureDomainsTable() moved to constructor; 12 per-method calls removed
• IndexDatabase.initialize(): Extended DROP TABLE list to include feature_flows, features, flow_subflow_steps, flow_definition_steps, flow_steps, interaction_definition_links, interactions, contract_participants, contracts — tables that are now eagerly created by repository constructors and must be cleared on initialize

Key decisions

• Root cause of test failures: Moving ensure calls to constructors caused IndexDatabase to eagerly create tables (including flow_definition_steps which references both flows and definitions) before initialize() was called. SQLite validates ON DELETE CASCADE chains when dropping tables, so DROP TABLE IF EXISTS flows failed with "no such table: main.definitions" because flow_definition_steps referenced both. Fixed by updating initialize() to drop all tables in correct dependency order
• Safe because idempotent: The ensure* functions use CREATE TABLE IF NOT EXISTS logic — calling them once in the constructor is functionally identical to calling them per-method

Test plan

• All 2256 tests pass (pnpm test)
• Build passes with no type errors (pnpm run build)
• Lint passes with no errors (Biome check)

Trello: https://trello.com/c/OBDKBd0E/33-as-a-developer-i-want-ensurexxxtables-guards-moved-to-repository-constructors-so-that-126-redundant-per-method-guard-calls-are-e

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[nhopeatall]

LGTM — This is a clean mechanical refactoring that correctly moves idempotent ensure*Tables() guard calls from per-method bodies to constructors. The change is safe because:

1. Idempotency preserved: All ensure* functions use CREATE TABLE IF NOT EXISTS / tableExists() checks, so calling them once in the constructor is functionally equivalent to calling them per-method.

2. initialize() DROP order is correct: The new DROP statements (feature_flows, features, flow_subflow_steps, flow_definition_steps, flow_steps, interaction_definition_links, interactions, contract_participants, contracts) are added in proper dependency order (child tables before parent tables), which handles the SQLite FK validation issue described in the PR.

3. Standalone repository usage (tests) is actually improved — tables are guaranteed to exist at construction time rather than relying on the first method call to create them.

4. CI confirms: All 2256 tests pass, lint clean, types clean.

Minor observation (not blocking): ContractRepository still uses per-method ensureContractsTables() calls (15 occurrences) and wasn't included in this refactoring. Could be a follow-up if desired.