Move schema initialization from ClickHouse init scripts to server startup

Server now applies schema via @PostConstruct using classpath SQL files.
All statements use IF NOT EXISTS/IF NOT EXISTS so it's idempotent and
safe to run on every startup. Removes ConfigMap and init script mount
from K8s manifest since ClickHouse no longer needs to manage the schema.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cameleer3-server-app/src/main/resources/clickhouse/01-schema.sql

@@ -0,0 +1,57 @@
+-- Cameleer3 ClickHouse Schema
+-- Tables for route executions, route diagrams, and agent metrics.
+
+CREATE TABLE IF NOT EXISTS route_executions (
+    execution_id     String,
+    route_id         LowCardinality(String),
+    agent_id         LowCardinality(String),
+    status           LowCardinality(String),
+    start_time       DateTime64(3, 'UTC'),
+    end_time         Nullable(DateTime64(3, 'UTC')),
+    duration_ms      UInt64,
+    correlation_id   String,
+    exchange_id      String,
+    error_message    String DEFAULT '',
+    error_stacktrace String DEFAULT '',
+    -- Nested processor executions stored as parallel arrays
+    processor_ids       Array(String),
+    processor_types     Array(LowCardinality(String)),
+    processor_starts    Array(DateTime64(3, 'UTC')),
+    processor_ends      Array(DateTime64(3, 'UTC')),
+    processor_durations Array(UInt64),
+    processor_statuses  Array(LowCardinality(String)),
+    -- Metadata
+    server_received_at DateTime64(3, 'UTC') DEFAULT now64(3, 'UTC'),
+    -- Skip indexes
+    INDEX idx_correlation correlation_id TYPE bloom_filter GRANULARITY 4,
+    INDEX idx_error error_message TYPE tokenbf_v1(32768, 3, 0) GRANULARITY 4
+)
+ENGINE = MergeTree()
+PARTITION BY toYYYYMMDD(start_time)
+ORDER BY (agent_id, status, start_time, execution_id)
+TTL toDateTime(start_time) + toIntervalDay(30)
+SETTINGS ttl_only_drop_parts = 1;
+
+CREATE TABLE IF NOT EXISTS route_diagrams (
+    content_hash     String,
+    route_id         LowCardinality(String),
+    agent_id         LowCardinality(String),
+    definition       String,
+    created_at       DateTime64(3, 'UTC') DEFAULT now64(3, 'UTC')
+)
+ENGINE = ReplacingMergeTree(created_at)
+ORDER BY (content_hash);
+
+CREATE TABLE IF NOT EXISTS agent_metrics (
+    agent_id         LowCardinality(String),
+    collected_at     DateTime64(3, 'UTC'),
+    metric_name      LowCardinality(String),
+    metric_value     Float64,
+    tags             Map(String, String),
+    server_received_at DateTime64(3, 'UTC') DEFAULT now64(3, 'UTC')
+)
+ENGINE = MergeTree()
+PARTITION BY toYYYYMMDD(collected_at)
+ORDER BY (agent_id, metric_name, collected_at)
+TTL toDateTime(collected_at) + toIntervalDay(30)
+SETTINGS ttl_only_drop_parts = 1;