Fix genre source validation and story-system fallback

Goal

Prevent English profile keys such as rules-mystery from becoming project genre truth, and make story-system fail explicitly instead of falling back to the first route row (玄幻退婚流) when a genre cannot be routed.

What I already know

The user confirmed the desired behavior: normalize the source, forbid English genre values, and explicitly error instead of using 玄幻退婚流 as a fallback.
rules-mystery originates from the legacy genre profile layer (references/genre-profiles.md) and profile-key mapping, not from the story-system CSV route table.
init_project.py currently writes the CLI genre argument directly into .webnovel/state.json.
story_system_engine._route() currently falls back to route_rows[0] when no route matches, which can silently select 玄幻退婚流.

Requirements

Initialization must reject genre values containing ASCII letters, such as rules-mystery, with an actionable error that points users to Chinese names such as 规则怪谈.
Story-system routing must not use the first CSV row as a default route when no match exists.
If story-system cannot route the provided query/genre, it must raise an explicit error and avoid generating .story-system contracts.
Valid Chinese genres such as 规则怪谈 must continue to route normally.
Existing profile-key behavior may remain as internal read-only compatibility, but it must not be accepted as project genre input.

Acceptance Criteria

init_project(..., genre="rules-mystery") fails before writing state.
StorySystemEngine(...).build(query="rules-mystery", genre="rules-mystery", ...) raises an explicit routing error.
StorySystemEngine(...).build(query="规则怪谈", genre="规则怪谈", ...) routes to canonical genre 悬疑.
No test expects unmatched routes to fall back to 玄幻退婚流.
Targeted tests pass.

Definition of Done

Tests added or updated for init validation and story-system routing failure.
Targeted pytest suite passes.
Existing unrelated working-tree changes are preserved.

Technical Approach

Add a narrow genre-input validator near initialization write boundaries.
Replace story-system's default_seed_fallback branch with an explicit failure path.
Keep canonical Chinese genre routing through existing resolve_genre() / route row matching.

Out of Scope

Reworking reference retrieval ranking.
Migrating existing projects that already have English genre values.
Renaming legacy profile IDs in genre-profiles.md.
Changing chapter-level dynamic context selection beyond route failure behavior.

Technical Notes

Likely files:
- webnovel-writer/scripts/init_project.py
- webnovel-writer/scripts/data_modules/story_system_engine.py
- webnovel-writer/scripts/data_modules/tests/test_story_system_engine.py
- webnovel-writer/scripts/data_modules/tests/test_init_project_pruning.py or a nearby init test module
Existing dirty files were present before this task; do not revert unrelated changes.

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