fix: cache_enabled never reaches the launcher Migrator gate

[aradng]

Bug

Migrator().run() in the launcher lifespan is gated on Configs.cache_enabled (launcher/main.py:40) — and that gate has been permanently False on every service, so redis-om RediSearch indexes are never created at boot. Symptom downstream: redis.exceptions.ResponseError: No such index cache:... on any BaseCache.find().

Two stacked causes:

1. SelfSustainingMeta.__getattr__ only fires on attribute miss. A class-body default like cache_enabled: bool = False lives in Configs.__dict__, so class access (Configs.cache_enabled) resolves to the stale default and never delegates to the singleton instance.
2. _setup_redis read RedisHandler.enabled (class access) — the same shadow (enabled: bool = False), and one line before RedisHandler(...) was even constructed — so even the instance-side self.cache_enabled ended up False.

Minimal repro of the metaclass semantics:

class Probe(SelfSustaining):
    flag: bool            # annotation-only
    legacy: bool = False  # class default

    def __init__(self):
        super().__init__()
        self.flag = self.legacy = False

p = Probe(); p.flag = p.legacy = True
Probe.flag    # True  — lookup misses, __getattr__ delegates to singleton
Probe.legacy  # False — class default shadows the instance

Fix (+5/−3, one file)

• cache_enabled: bool annotation-only, initialised to False in __init__ — class access now delegates through the metaclass.
• _setup_redis constructs RedisHandler first and reads enabled off the instance.

RedisHandler.enabled's own class default is left untouched: tenant/depends.py:64 reads it at class level on non-redis services where the handler is never constructed, and removing the default would turn that into an AttributeError.

Verification

Dropped the FT indexes in redis, restarted a fastloom service (assistant) with this patch — boot-time Migrator recreated them with no manual intervention:

cache:assistant.schemas.curve_graph.CurveGraphContextCache:index
cache:assistant.schemas.product.ProductCache:index

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