chore: rename cameleer3 to cameleer

Rename Java packages from com.cameleer3 to com.cameleer, module
directories from cameleer3-* to cameleer-*, and all references
throughout workflows, Dockerfiles, docs, migrations, and pom.xml.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -75,7 +75,7 @@ Recent decisions affecting current work:
 - [Roadmap]: Phases 2 and 3 can execute in parallel (both depend only on Phase 1)
 - [Roadmap]: Web UI deferred to v2
 - [Phase 01]: Used spring-boot-starter-jdbc for JdbcTemplate + HikariCP auto-config
-- [Phase 01]: Created MetricsSnapshot record in core module (cameleer3-common has no metrics model)
+- [Phase 01]: Created MetricsSnapshot record in core module (cameleer-common has no metrics model)
 - [Phase 01]: Upgraded testcontainers to 2.0.3 for Docker Desktop 29.x compatibility
 - [Phase 01]: Changed error_message/error_stacktrace to non-nullable String for tokenbf_v1 index compat
 - [Phase 01]: TTL expressions require toDateTime() cast for DateTime64 columns in ClickHouse 25.3
@@ -121,7 +121,7 @@ None yet.
 ### Blockers/Concerns
 
 - [Phase 1]: ClickHouse Java client API needs phase-specific research (library has undergone changes)
-- [Phase 1]: Must read cameleer3-common PROTOCOL.md before designing ClickHouse schema
+- [Phase 1]: Must read cameleer-common PROTOCOL.md before designing ClickHouse schema
 - [Phase 2]: Diagram rendering library selection is an open question (Batik, jsvg, JGraphX, or client-side)
 - [Phase 2]: ClickHouse skip indexes may not suffice for full-text; decision point during Phase 2